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A320592
Number of partitions of n with four parts in which no part occurs more than twice.
2
1, 1, 3, 4, 6, 8, 12, 14, 19, 23, 29, 34, 42, 48, 58, 66, 77, 87, 101, 112, 128, 142, 160, 176, 197, 215, 239, 260, 286, 310, 340, 366, 399, 429, 465, 498, 538, 574, 618, 658, 705, 749, 801, 848, 904, 956, 1016, 1072, 1137, 1197, 1267, 1332, 1406, 1476, 1556
OFFSET
6,3
LINKS
FORMULA
G.f.: -(x^4-x^2-1)*x^6/((x^2+1)*(x^2+x+1)*(x+1)^2*(x-1)^4).
CROSSREFS
Column k=4 of A209318.
Sequence in context: A214583 A232721 A227956 * A225531 A129295 A192276
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Oct 16 2018
STATUS
approved