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A012790
tanh(sec(x)*arcsin(x))=x+2/3!*x^3-20/5!*x^5-1104/7!*x^7-23728/9!*x^9...
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1, 2, -20, -1104, -23728, 2048224, 394518592, 28921612032, -3968669081344, -2038929577444864, -347998546570798080, 59058720637105172480, 67936182152875665510400, 22515279368057454566531072
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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