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⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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sech(arctan(tanh(x)))=1-1/2!*x^2+21/4!*x^4-1101/6!*x^6+109001/8!*x^8...
#7 by Sean A. Irvine at Tue Sep 30 20:34:15 EDT 2025
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Discussion
Tue Sep 30
20:34
OEIS Server: https://oeis.org/edit/global/3039
#6 by Harvey P. Dale at Sun Oct 01 12:13:39 EDT 2017
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#5 by Harvey P. Dale at Sun Oct 01 12:13:35 EDT 2017
MATHEMATICA
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#4 by Charles R Greathouse IV at Fri Feb 24 12:50:44 EST 2012
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Discussion
Fri Feb 24
12:50
OEIS Server: https://oeis.org/edit/global/108
#3 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003
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AUTHOR
#2 by N. J. A. Sloane at Sun Jun 14 03:00:00 EDT 1998
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#1 by N. J. A. Sloane at Wed Dec 11 03:00:00 EST 1996
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OFFSET
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