A012241 log(cos(arcsinh(x))) = -1/2!*x^2+2/4!*x^4-40/6!*x^6+1360/8!*x^8...

-1, 2, -40, 1360, -87680, 8723200, -1254323200, 245463296000, -62768582656000, 20318491009024000, -8121379360440320000, 3928322245164728320000, -2261534088991670272000000

Offset

0,2

Links

Table of n, a(n) for n=0..12.

Crossrefs

Sequence in context: A322179 A012834 A304448 * A341589 A286124 A275931

Adjacent sequences: A012238 A012239 A012240 * A012242 A012243 A012244

Keyword

sign

Author

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

Status

approved