login
A012620
sec(arcsinh(x)*tan(x))=1+12/4!*x^4+120/6!*x^6+15120/8!*x^8...
0
1, 0, 12, 120, 15120, 640320, 143136576, 14091272832, 5105629251840, 906008454739968, 490783256100396032, 136461255865204086784, 104233836908816608661504, 41544908070600747941806080
OFFSET
0,3
CROSSREFS
Sequence in context: A301898 A012441 A012373 * A012564 A012442 A262204
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved