

A067619


Total number of parts in all selfconjugate partitions of n. Also, sum of largest parts of all selfconjugate partitions of n.


4



0, 1, 0, 2, 2, 3, 3, 4, 7, 8, 9, 10, 15, 16, 18, 23, 30, 32, 35, 42, 51, 59, 63, 73, 89, 100, 106, 125, 145, 160, 174, 198, 229, 255, 274, 310, 355, 388, 420, 472, 534, 582, 631, 701, 784, 859, 928, 1021, 1144, 1243, 1338, 1475, 1630, 1767, 1909, 2089, 2299
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OFFSET

0,4


LINKS

T. D. Noe, Table of n, a(n) for n = 0..1000
Arnold Knopfmacher and Neville Robbins, Identities for the total number of parts in partitions of integers, Util. Math. 67 (2005), 918.


FORMULA

G.f.: Sum for n>=1 of n q^(2n1) (1+q) (1+q^3) ... (1+q^(2n3)).


MATHEMATICA

CoefficientList[Series[Sum[n*q^(2n1)*Product[1+q^k, {k, 1, 2n3, 2}], {n, 1, 30}], {q, 0, 60}], q]


CROSSREFS

Cf. A000700, A000701, A006128, A015723, A046682, A079499.
Sequence in context: A241152 A164529 A153906 * A236972 A184351 A146922
Adjacent sequences: A067616 A067617 A067618 * A067620 A067621 A067622


KEYWORD

easy,nonn,changed


AUTHOR

Naohiro Nomoto, Feb 01 2002


EXTENSIONS

Edited by Dean Hickerson, Feb 11 2002


STATUS

approved



