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 A293192 a(n) = n! * [x^n] exp(n*arctan(x)). 2
 1, 1, 4, 21, 128, 745, 1440, -89075, -3031040, -76951215, -1784742400, -39056351675, -785147904000, -12815410658375, -64977212518400, 8229576066616125, 587339977981952000, 29185361934747006625, 1256364637107240960000, 48860370609512175371125, 1686271331087959982080000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS 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 Cf. A002019. Sequence in context: A007345 A255673 A099250 * A300674 A232956 A234268 Adjacent sequences:  A293189 A293190 A293191 * A293193 A293194 A293195 KEYWORD sign AUTHOR Ilya Gutkovskiy, Oct 02 2017 STATUS approved

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Last modified May 18 10:19 EDT 2021. Contains 343995 sequences. (Running on oeis4.)