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%I #9 Nov 04 2017 08:07:50
%S 1,-1,-8,-19,-21,139,448,1414,1206,-3865,-21271,-65257,-116480,-76230,
%T 494952,2082603,5801391,10117600,8498261,-25314504,-144955267,
%U -405982721,-858529330,-1081275709,126891854,6202698189,22569319856,56419872881,102176753056
%N Expansion of Product_{k>=1} (1 - k^2*x^k)^k.
%H Seiichi Manyama, <a href="/A294581/b294581.txt">Table of n, a(n) for n = 0..6927</a>
%o (PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, (1-k^2*x^k)^k))
%Y Column k=2 of A294580.
%K sign
%O 0,3
%A _Seiichi Manyama_, Nov 02 2017
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