A319517 - OEIS

A319517

Expansion of Product_{1 <= i_1 <= i_2 <= i_3 <= i_4} (1 - x^(i_1*i_2*i_3*i_4)).

1, -1, -1, 0, -1, 2, 0, 2, -1, 0, 3, -1, -2, -1, 1, -6, -1, 0, 0, 0, 7, -1, 1, -2, 4, 1, -2, 11, 1, -2, -10, 11, -11, 15, -16, -6, -7, -10, -1, 10, -5, -10, 12, -20, 19, -16, 24, -2, 28, -9, 41, -6, 15, 20, 4, -21, -15, -13, -14, 13, -73, 67, -30, -44, -19, 31, -30

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OFFSET

0,6

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

FORMULA

G.f.: Product_{k>0} (1 - x^k)^A218320(k).

CROSSREFS

Convolution inverse of A321566.

Product_{1 <= i_1 <= i_2 <= ... <= i_b} (1 - x^(i_1 * i_2 * ... * i_b)): A010815 (b=1), A321299 (b=2), A321361 (b=3), this sequence (b=4).

Cf. A218320, A321460, A321567.

Sequence in context: A097364 A254204 A321361 * A321460 A177446 A074905

Adjacent sequences: A319514 A319515 A319516 * A319518 A319519 A319520

KEYWORD

sign

AUTHOR

Seiichi Manyama, Nov 14 2018

STATUS

approved