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A013205
Expansion of e.g.f. log(sech(x) + arctan(x)).
0
0, 1, -2, 3, -8, 53, -320, 1799, -14464, 154985, -1601152, 16589771, -211517440, 3172731677, -47440986112, 721614303695, -12501759557632, 241340829836497, -4730336839303168, 94965599172723859
OFFSET
0,3
EXAMPLE
x - 2/2!*x^2 + 3/3!*x^3 - 8/4!*x^4 + 53/5!*x^5 ...
CROSSREFS
Sequence in context: A126464 A041979 A001686 * A340486 A245384 A292893
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0)=0 inserted and title improved by Sean A. Irvine, Aug 01 2018
STATUS
approved