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A009429
E.g.f. log(1+x)/cos(x).
5
0, 1, -1, 5, -12, 69, -285, 2001, -12208, 104073, -854865, 8723549, -90552396, 1088372557, -13647385661, 190057979177, -2787246189120, 44285819490065, -742019231348865, 13267464006201781, -249642268776311020
OFFSET
0,4
LINKS
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) / cos(1). - Vaclav Kotesovec, Jan 23 2015
EXAMPLE
log(1+x)/cos(x) = 0 + x - 1/2*x^2 + 5/6*x^3 - 1/2*x^4 + 23/40*x^5 -+ ...
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Log[1+x]/Cos[x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jan 26 2013 *)
CROSSREFS
Sequence in context: A219770 A246176 A009413 * A207821 A297644 A242043
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved