A013502 exp(sec(x)-cosh(x))=1+4/4!*x^4+60/6!*x^6+1944/8!*x^8+100920/10!*x^10...

1, 0, 4, 60, 1944, 100920, 7475884, 751912980, 98422975824, 16234482600240, 3291096841607764, 803683798982126700, 232547478441133195704, 78638339747954023956360, 30716698087655852509331644

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Crossrefs

Sequence in context: A336637 A330069 A211309 * A303286 A322450 A099705

Adjacent sequences: A013499 A013500 A013501 * A013503 A013504 A013505

Keyword

nonn

Author

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

Extensions

Checked by N. J. A. Sloane, Dec 17 2011

Status

approved