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A035025
Constant term of (normalized Delta)^(-n).
0
24, 1224, 70080, 4225320, 262350144, 16601086656, 1064505632256, 68930439949800, 4497211032959040, 295166841587267904, 19466935185947613696, 1289057050529747464896, 85647693620610353594880
OFFSET
1,1
COMMENTS
Normalized Delta generates Ramanujan tau function.
LINKS
B. Brent, Quadratic Minima and Modular Forms, Experimental Mathematics, v.7 no.3, 257-274.
EXAMPLE
(\tau(1)q+\tau(2)q^2+...)^(-1)=q^(-1)+24+...
MATHEMATICA
a[n_] := (delta = Series[ q*Product[ (1-q^k)^24, {k, 1, n}] , {q, 0, n+1}]; SeriesCoefficient[ Series[ delta^-n, {q, 0, 0}], 0]); Table[a[n], {n, 1, 13}] (* Jean-François Alcover, Feb 20 2012 *)
CROSSREFS
Sequence in context: A042107 A042104 A069991 * A074652 A374888 A367706
KEYWORD
easy,nice,nonn
AUTHOR
Barry Brent (barryb(AT)primenet.com)
STATUS
approved