A013196 Expansion of e.g.f. log(sec(x) + arctan(x)).

0, 1, 0, -3, 16, -27, -48, 777, -5504, 48905, -149120, -4320107, 76593152, -424303635, -2866784256, 77237001761, -1179358298112, 20512289602833, -131744654655488, -6321209675239123, 194063863443816448

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Example

x - 3/3!*x^3 + 16/4!*x^4 - 27/5!*x^5 - 48/6!*x^6 ...

Crossrefs

Sequence in context: A298873 A298876 A258717 * A371382 A329866 A339634

Adjacent sequences: A013193 A013194 A013195 * A013197 A013198 A013199

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