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A012478 sec(cos(x)*sin(x))=1+1/2!*x^2-11/4!*x^4-83/6!*x^6+10505/8!*x^8... 0
1, 1, -11, -83, 10505, 6009, -60553539, 2140355557, 1174906248337, -146823377897103, -55094515820657147, 17482899642565858461, 4900898798285366105753, -3664217968514770645784087 (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: A129077 A152582 A191003 * A239461 A026783 A244975

Adjacent sequences:  A012475 A012476 A012477 * A012479 A012480 A012481

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified November 27 22:46 EST 2014. Contains 250286 sequences.