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A262310 a(n) = coefficient of x^(2n) in the expansion of the modular form Product_{k>=1} (1-x^k)^n. 2
1, -1, 1, -7, 9, 9, 49, -176, 57, -673, 2401, 1143, -9063, 33201, -153502, 315783, -755943, 2210985, -767039, 1790369, -40127031, 44496424, -58813391, 1040502519, -1696965207, -1810005816, -4483997699, 7445790947, 105920054242, -134133273672, -203398909151 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..30.

MAPLE

C7:=proc(r) local t1, n;

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

series(t1, x, 2*r+1);

coeff(%, x, 2*r);

end;

[seq(C7(i), i=0..30)];

CROSSREFS

Bisections: A262537, A262538.

Sequence in context: A121313 A111204 A000510 * A167628 A112954 A031952

Adjacent sequences:  A262307 A262308 A262309 * A262311 A262312 A262313

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Oct 04 2015

STATUS

approved

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Last modified August 22 20:47 EDT 2019. Contains 326209 sequences. (Running on oeis4.)