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A012569 sec(sinh(x)*cos(x))=1+1/2!*x^2-3/4!*x^4-123/6!*x^6-455/8!*x^8... 0
1, 1, -3, -123, -455, 162889, 7941813, -647037363, -141890950799, 176381997457, 4580546025413229, 624311846901265941, -219756895048343473751, -104610854473143576793127 (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: A229633 A171357 A209363 * A078258 A258658 A222186

Adjacent sequences:  A012566 A012567 A012568 * A012570 A012571 A012572

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified February 26 05:51 EST 2020. Contains 332277 sequences. (Running on oeis4.)