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A012241
log(cos(arcsinh(x))) = -1/2!*x^2+2/4!*x^4-40/6!*x^6+1360/8!*x^8...
0
-1, 2, -40, 1360, -87680, 8723200, -1254323200, 245463296000, -62768582656000, 20318491009024000, -8121379360440320000, 3928322245164728320000, -2261534088991670272000000
OFFSET
0,2
CROSSREFS
Sequence in context: A322179 A012834 A304448 * A341589 A286124 A275931
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved