

A000293


a(n) = number of solid (i.e., threedimensional) partitions of n.
(Formerly M3392 N1371)


33



1, 1, 4, 10, 26, 59, 140, 307, 684, 1464, 3122, 6500, 13426, 27248, 54804, 108802, 214071, 416849, 805124, 1541637, 2930329, 5528733, 10362312, 19295226, 35713454, 65715094, 120256653, 218893580, 396418699, 714399381, 1281403841, 2287986987, 4067428375, 7200210523, 12693890803, 22290727268, 38993410516, 67959010130, 118016656268, 204233654229, 352245710866, 605538866862, 1037668522922, 1772700955975, 3019333854177, 5127694484375, 8683676638832, 14665233966068, 24700752691832, 41495176877972, 69531305679518
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OFFSET

0,3


COMMENTS

An ordinary partition is a row of numbers in nondecreasing order whose sum is n. Here the numbers are in a threedimensional pile, nondecreasing in the x, y and zdirections.
Finding a g.f. for this sequence is an unsolved problem. At first it was thought that it was given by A000294.
Equals A000041 convolved with A002836: [1, 0, 2, 5, 12, 24, 56, 113, ...] and row sums of the convolution triangle A161564.  Gary W. Adamson, Jun 13 2009


REFERENCES

A. O. L. Atkin, P. Bratley, I. G. McDonald and J. K. S. McKay, Some computations for mdimensional partitions, Proc. Camb. Phil. Soc., 63 (1967), 10971100.
P. Bratley and J. K. S. McKay, Algorithm 313: Multidimensional partition generator, Comm. ACM, 10 (Issue 10, 1967), p. 666.
D. E. Knuth, A note on solid partitions, Math. Comp., 24 (1970), 955961.
P. A. MacMahon, Memoir on the theory of partitions of numbers  Part VI, Phil. Trans. Roal Soc., 211 (1912), 345373.
P. A. MacMahon, Combinatory Analysis. Cambridge Univ. Press, London and New York, Vol. 1, 1915 and Vol. 2, 1916; see vol. 2, p 332.
S. P. Naveen, On The Asymptotics of Some Counting Problems in Physics, Thesis, Bachelor of Technology, DEPARTMENT OF PHYSICS, INDIAN INSTITUTE OF TECHNOLOGY, MADRAS, May 2011; http://www.physics.iitm.ac.in/~suresh/theses/NaveenThesis.pdf
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Suresh Govindarajan, Table of n, a(n) for n = 0..72
A. O. L. Atkin, P. Bratley, I. G. McDonald and J. K. S. McKay, Some computations for mdimensional partitions, Proc. Camb. Phil. Soc., 63 (1967), 10971100. [Annotated scanned copy]
Srivatsan Balakrishnan, Suresh Govindarajan and Naveen S. Prabhakar, On the asymptotics of higherdimensional partitions, arXiv:1105.6231.
Nicolas Destainville and Suresh Govindarajan, Estimating the asymptotics of solid partitions, J. Stat. Phys. 158 (2015) 950967; arXiv:1406.5605.
Suresh Govindarajan, Solid Partitions Project Dec 14, 2010
P. A. MacMahon, Combinatory analysis.
Ville Mustonen and R. Rajesh, Numerical Estimation of the Asymptotic Behaviour of Solid Partitions of an Integer, J. Phys. A 36 (2003), no. 24, 66516659.
Eric Weisstein's World of Mathematics, Solid Partition


EXAMPLE

Examples for n=2 and n=3.
a(2) = 4: 2; 11 where the first 1 is at the origin and the second 1 is in the x, y or z direction.
a(3) = 10: 3; 21 where the 2 is at the origin and the 1 is on the x, y or z axis; 111 (a row of 3 ones on the x, y or z axes); and three 1's with one 1 at the origin and the other two 1's on two of the three axes.


CROSSREFS

Cf. A000041, A000219, A000294, A000334, A000390, A002835, A002836, A005980, A037452, A080207, A082535.
Cf. A002836, A000041, A161564.  Gary W. Adamson, Jun 13 2009
Sequence in context: A022812 A192306 A276432 * A000294 A133086 A285186
Adjacent sequences: A000290 A000291 A000292 * A000294 A000295 A000296


KEYWORD

nonn,nice


AUTHOR

N. J. A. Sloane


EXTENSIONS

More terms from the Mustonen and Rajesh article, May 02 2003
a(51)a(62) found by Suresh Govindarajan and students, Dec 14 2010
a(63)a(68) found by Suresh Govindarajan and students, Jun 01 2011
a(69)a(72) found by Suresh Govindarajan and Srivatsan Balakrishnan, Jan 03 2013


STATUS

approved



