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A012959 sech(tan(x)+arcsin(x))=1-4/2!*x^2+56/4!*x^4-1894/6!*x^6+120872/8!*x^8... 0
1, -4, 56, -1894, 120872, -12371994, 1856495604, -384431704934, 104893865610544, -36513587479094898, 15776775677608315084, -8290816621524021595806, 5204162380787016330112520 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A243486 A322733 A012983 * A013113 A009105 A168481

Adjacent sequences:  A012956 A012957 A012958 * A012960 A012961 A012962

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified February 25 19:53 EST 2020. Contains 332258 sequences. (Running on oeis4.)