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Search: id:A012154
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A012154 sech(tan(tan(x)))=1-1/2!*x^2-11/4!*x^4-253/6!*x^6-9015/8!*x^8... +0
1
1, -1, -11, -253, -9015, -362009, 2294909, 7143505067, 2709263596817, 958529947538255, 359564035447469189, 146418020203030157779, 64393370639942123229401, 29924760789755403918019639 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A098672 A056210 A089298 this_sequence A009055 A009067 A128683

Adjacent sequences: A012151 A012152 A012153 this_sequence A012155 A012156 A012157

KEYWORD

sign

AUTHOR

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

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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