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A012674
sec(tanh(x)*tan(x)) = 1+12/4!*x^4+14672/8!*x^8+120702912/12!*x^12...
0
1, 12, 14672, 120702912, 3622154930432, 288623184943967232, 50388328491376236941312, 16943473357578443028001308672, 10004545242456252590707488012173312
OFFSET
0,2
CROSSREFS
Sequence in context: A317958 A012608 A012735 * A301533 A013514 A340166
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved