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A012686 sec(tanh(x)*arctan(x))=1+12/4!*x^4-480/6!*x^6+35280/8!*x^8... 0
1, 0, 12, -480, 35280, -4208640, 737643456, -178203637248, 56744323733760, -23028982493429760, 11602867906455268352, -7105927543880909185024, 5198792960623369943994368, -4478214849312972324010721280 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A012685 A012465 A012394 * A012466 A229634 A196704

Adjacent sequences:  A012683 A012684 A012685 * A012687 A012688 A012689

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified February 28 23:19 EST 2020. Contains 332353 sequences. (Running on oeis4.)