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A012830 arctanh(sec(x)*arcsinh(x))=x+4/3!*x^3+88/5!*x^5+4184/7!*x^7... 0
1, 4, 88, 4184, 398848, 58835456, 12993783424, 3911934210560, 1562951627091968, 793328025614454784, 501079933291827593216, 384338283691725654392832, 352458553186266111883247616 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A028554 A154137 A154136 * A012946 A013101 A013067

Adjacent sequences:  A012827 A012828 A012829 * A012831 A012832 A012833

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 03:22 EST 2012. Contains 205694 sequences.