OFFSET
0,3
MATHEMATICA
Table[n! SeriesCoefficient[Exp[n ArcTan[x]], {x, 0, n}], {n, 0, 20}]
Table[n! SeriesCoefficient[Exp[n Sum[(-1)^k x^(2 k + 1)/(2 k + 1), {k, 0, Infinity}]], {x, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, Oct 02 2017
STATUS
approved