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A012810
arctanh(sec(x)*atan(x))=x+3/3!*x^3+73/5!*x^5+2779/7!*x^7...
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1, 3, 73, 2779, 260177, 32853491, 6787498521, 1803655970635, 660549566885793, 299826162055728355, 172107541834064358121, 118707937911469881769147, 98574741929922225569568241
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
AT&T Labs Research
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