A013281 sech(log(x+1)-arcsinh(x))=1-3/4!*x^4+30/5!*x^5-180/6!*x^6+945/7!*x^7...

1, 0, 0, 0, -3, 30, -180, 945, -6615, 56700, -368550, 1091475, 3274425, -85135050, 3235131900, -86199238125, 1340238524625, -15196606425000, 229968074085750, -4642248475990125, 57810007510880625

Offset

0,5

Links

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

Crossrefs

Sequence in context: A002463 A360645 A344564 * A013274 A013279 A013280

Adjacent sequences: A013278 A013279 A013280 * A013282 A013283 A013284

Keyword

sign

Author

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

Status

approved