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A000104 Number of n-celled polyominoes without holes.
(Formerly M1424 N0560)
13
1, 1, 1, 2, 5, 12, 35, 107, 363, 1248, 4460, 16094, 58937, 217117, 805475, 3001127, 11230003, 42161529, 158781106, 599563893, 2269506062, 8609442688, 32725637373, 124621833354, 475368834568, 1816103345752, 6948228104703 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

E. V. Konstantinova and M. V. Vidyuk, Discriminating tests of information and topological indices; animals and trees; J. Chem. Inf. Comput. Sci., 43 (2003), 1860-1871.

J. S. Madachy, Pentominoes - Some Solved and Unsolved Problems, J. Rec. Math., 2 (1969), 181-188.

T. R. Parkin, L. J. Lander and D. R. Parkin, ``Polyomino enumeration results,'' SIAM Fall Meeting, Santa Barbara, California, 1967.

R. C. Read, Contributions to the cell growth problem, Canad. J. Math., 14 (1962), 1-20.

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

Table of n, a(n) for n=0..26.

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Cf. A000105, A006746, A056877, A006748, A056878, A006747, A006749, A006884, A006885, A006877, A006878, A033492, A054361.

Sequence in context: A054359 A148287 A036357 * A000105 A055192 A108555

Adjacent sequences:  A000101 A000102 A000103 * A000105 A000106 A000107

KEYWORD

nonn,nice,hard

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Extended to n=26 by Tomas Oliveira e Silva.

STATUS

approved

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Last modified December 20 20:08 EST 2014. Contains 252289 sequences.