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A012464 arctanh(atan(x)*atan(x))=2/2!*x^2-16/4!*x^4+608/6!*x^6-43776/8!*x^8... 0
2, -16, 608, -43776, 5490432, -1043742720, 281302333440, -101944270848000, 47833801306275840, -28212954337286553600, 20432760600063600230400, -17826780360146975037849600, 18441699370235590444905922560 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

CROSSREFS

Sequence in context: A013177 A060279 A012757 * A128294 A015188 A005118

Adjacent sequences:  A012461 A012462 A012463 * A012465 A012466 A012467

KEYWORD

sign

AUTHOR

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

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Last modified February 16 03:44 EST 2012. Contains 205860 sequences.