A143241 - OEIS

A143241

Expansion of Product_{k>0} (1 - x^k) / (1 - x^(6*k - 2)).

1, -1, -1, 0, 1, 0, -1, 1, 1, 0, 0, 0, -1, 0, 0, 0, 0, 0, -1, 0, 1, 0, -1, 0, 0, 0, 1, 1, -1, 0, 1, 0, 0, 0, -1, -1, 1, 1, 0, 0, -1, 0, 1, 0, -1, -1, 0, 0, 1, 0, -1, 0, 0, 0, 1, 0, -1, 0, 1, 0, 0, 1, -1, -1, 1, 0, 1, 0, -1, -1, 1, 1, -1, 1, 0, -1, 1, 1, 0, -1, -1, -1, 1, 1, -1, -1, 0, 0, 1, 1, -1, -1, 0, 0, 1, 1, -1, -1, 0, 0, 1, 1, -1, -2, 0

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OFFSET

0,104

COMMENTS

|a(n)|<2 if n<103, |a(n)|<3 if n<161.

LINKS

Table of n, a(n) for n=0..104.

FORMULA

Euler transform of period 6 sequence [ -1, -1, -1, 0, -1, -1, ...].

G.f.: Product_{k>0} (1 - x^k) / (1 - x^(6*k - 2)).

EXAMPLE

1 - q - q^2 + q^4 - q^6 + q^7 + q^8 - q^12 - q^18 + q^20 - q^22 + ...