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A270666
E.g.f.: Product_{k>=1} (1 + tan(x^k)).
9
1, 1, 2, 14, 48, 416, 3360, 29504, 274176, 3503104, 45192960, 579956992, 8982251520, 138130720768, 2456648183808, 45868468109312, 871166211686400, 17536583860060160, 393972064172900352, 8704569607311982592, 210657904645299240960, 5322004254737369399296
OFFSET
0,3
MATHEMATICA
nmax = 25; Range[0, nmax]! * CoefficientList[Series[Product[(1+Tan[x^k]), {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Mar 21 2016
STATUS
approved