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Search: id:A012133
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A012133 sech(arcsin(tanh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8369/8!*x^8... +0
1
1, -1, 9, -201, 8369, -559601, 54852729, -7411089401, 1320161221089, -299803443573601, 84543945702681449, -28984920596097196201, 11872728882101557841809, -5726623333843769342341201 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A052145 A012061 A012168 this_sequence A012038 A012108 A103914

Adjacent sequences: A012130 A012131 A012132 this_sequence A012134 A012135 A012136

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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