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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 6..10000

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

Adjacent sequences:  A320589 A320590 A320591 * A320593 A320594 A320595

KEYWORD

nonn,easy

AUTHOR

Alois P. Heinz, Oct 16 2018

STATUS

approved

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Last modified October 15 07:56 EDT 2019. Contains 328026 sequences. (Running on oeis4.)