A013438 sech(arcsin(x)-arctanh(x))=1-10/6!*x^6-840/8!*x^8-87750/10!*x^10...

1, 0, 0, -10, -840, -87750, -12248500, -2253971850, -533589966000, -158691603820750, -58067784952807500, -25679245305449531250, -13515821293834796365000, -8355912675896675805093750

Offset

0,4

Links

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

Crossrefs

Sequence in context: A013385 A013383 A013387 * A013434 A013436 A013437

Adjacent sequences: A013435 A013436 A013437 * A013439 A013440 A013441

Keyword

sign

Author

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

Status

approved