A286950 - OEIS

A286950

Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of Product_{j>=1} (1 - x^j)/(1 - x^(k*j))^k.

1, 1, -1, 1, 0, -1, 1, -1, 0, 0, 1, -1, 1, 0, 0, 1, -1, -1, -2, 0, 1, 1, -1, -1, 3, 3, 0, 0, 1, -1, -1, 0, -3, -4, 0, 1, 1, -1, -1, 0, 4, -2, 5, 0, 0, 1, -1, -1, 0, 0, -3, 9, -7, 0, 0, 1, -1, -1, 0, 0, 6, -4, -8, 10, 0, 0, 1, -1, -1, 0, 0, 1, -5, 1, -6, -13, 0, 0, 1

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OFFSET

0,19

LINKS

Seiichi Manyama, Antidiagonals n = 0..139, flattened

FORMULA

G.f. of column k: Product_{j>=1} (1 - x^j)/(1 - x^(k*j))^k.

EXAMPLE

Square array begins:

1, 1, 1, 1, 1, ...

-1, 0, -1, -1, -1, ...

-1, 0, 1, -1, -1, ...