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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 A344113 A229634
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 May 16 08:15 EDT 2024. Contains 372549 sequences. (Running on oeis4.)