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A013567
sech(log(x+1)/exp(x))=1-1/2!*x^2+9/3!*x^3-54/4!*x^4+210/5!*x^5...
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1
1, 0, -1, 9, -54, 210, 510, -24500, 355544, -3310776, 7970880, 511460048, -14772993312, 247420878848, -2080751146656, -34093875419760, 2085552636479488, -56037789835944320, 880848150693672192
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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