A012820 sech(sec(x)*sinh(x))=1-1/2!*x^2-11/4!*x^4-37/6!*x^6+7145/8!*x^8...

1, -1, -11, -37, 7145, 450711, -3070179, -4923539597, -586954253103, 57287087552943, 41119408518068293, 5965331366096594059, -2749345524263504663367, -1905635088547220040309433

Offset

0,3

Links

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

Crossrefs

Sequence in context: A232976 A084018 A235874 * A162929 A116059 A100842

Adjacent sequences: A012817 A012818 A012819 * A012821 A012822 A012823

Keyword

sign

Author

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

Status

approved