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Search: id:A012809
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A012809 tanh(sec(x)*arctan(x))=x-1/3!*x^3+25/5!*x^5-1209/7!*x^7+68945/9!*x^9... +0
1
1, -1, 25, -1209, 68945, -7692881, 1181481769, -242740782153, 66317255314721, -22739603323053601, 9634203397240829625, -4937246969845634306905, 3007627322996781467655025 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A112102 A012799 A120694 this_sequence A014769 A012851 A096330

Adjacent sequences: A012806 A012807 A012808 this_sequence A012810 A012811 A012812

KEYWORD

sign

AUTHOR

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

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.

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