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A262539 a(n) = coefficient of x^n in the expansion of  Product_{k>=1} (1-x^k)^(3*n). 2
1, -3, 9, -12, -99, 1107, -7038, 33345, -113643, 151593, 1547469, -17376120, 112734378, -544200660, 1884830229, -2551628817, -26299018683, 298555990425, -1956243650733, 9538198578972, -33464928293199, 47571625958796, 452674080810576, -5260288747038957, 34841458485708282, -171603777320158968 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

MAPLE

C3:=proc(k) local t1, n;

t1:=mul((1-x^n)^(3*k), n=1..k+2);

series(t1, x, k+1);

coeff(%, x, k);

end;

[seq(C3(i), i=0..30)];

CROSSREFS

Bisections: A262540, A262541.

Sequence in context: A261950 A137344 A029524 * A101537 A070353 A029458

Adjacent sequences:  A262536 A262537 A262538 * A262540 A262541 A262542

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Oct 04 2015

STATUS

approved

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Last modified March 24 11:49 EDT 2019. Contains 321448 sequences. (Running on oeis4.)