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Search: id:A012463
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A012463 tanh(arctan(x)*atan(x))=2/2!*x^2-16/4!*x^4+128/6!*x^6+9984/8!*x^8... +0
1
2, -16, 128, 9984, -1686528, 211630080, -21438504960, -115777536000, 1290343156285440, -677718502185369600, 262776565415742013440, -69499554745499013611520, -9137401716948937432104960 (list; graph; listen)
OFFSET

0,1
CROSSREFS

Sequence in context: A013730 A161737 A012459 this_sequence A037517 A037720 A022018

Adjacent sequences: A012460 A012461 A012462 this_sequence A012464 A012465 A012466

KEYWORD

sign

AUTHOR

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

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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