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A069685
Denominators of coefficients in -log(1+x)log(1-x) power series.
1
1, 12, 180, 1680, 12600, 166320, 2522520, 576576, 22054032, 465585120, 2560718160, 64250746560, 348024877200, 1124388064800, 4990906206000, 165032631878400, 350694342741600, 2599263952084800, 101515697684200800
OFFSET
1,2
FORMULA
a(n) = n*A076100(n) (conjectured). - F. Chapoton, Nov 09 2009
PROG
(PARI) my(x='x+O('x^50), v=Vec(-log(1+x)*log(1-x))); apply(denominator, vector(#v\2, k, v[2*k-1])) \\ Michel Marcus, Feb 16 2021
CROSSREFS
Sequence in context: A350541 A130550 A073975 * A000515 A241710 A318245
KEYWORD
easy,frac,nonn
AUTHOR
Benoit Cloitre, May 03 2002
STATUS
approved