A012050 sech(sin(tanh(x)))=1-1/2!*x^2+17/4!*x^4-673/6!*x^6+48481/8!*x^8...

1, -1, 17, -673, 48481, -5556929, 930399601, -214412110305, 65104843008449, -25194079035190657, 12104203127776694225, -7069126951831617433377, 4932323527151866597114145, -4052159085639349626953573441

Offset

0,3

Links

Table of n, a(n) for n=0..13.

Crossrefs

Sequence in context: A089018 A118769 A009158 * A012157 A012137 A171198

Adjacent sequences: A012047 A012048 A012049 * A012051 A012052 A012053

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Status

approved