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A012007 cosh(log(cos(x)))= 1+3/4!*x^4+30/6!*x^6+693/8!*x^8+25260/10!*x^10... 4
1, 0, 3, 30, 693, 25260, 1351383, 99680490, 9695756073, 1202439837720, 185185594118763, 34674437196568950, 7757267081778543453, 2043536254646561946180, 626129820701814932734143 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

a(n) = (1/2)*((-1)^n+A000364(n)). Also cosh(log(cos(x))) = 1/2*(cos(x)+1/cos(x)) is the reciprocal of the e.g.f. of A012009. - Peter Bala, Dec 02 2011

CROSSREFS

Cf. A012003, A012008, A012009.

Sequence in context: A007019 A186941 A082879 * A065753 A113677 A174549

Adjacent sequences:  A012004 A012005 A012006 * A012008 A012009 A012010

KEYWORD

nonn

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

EXTENSIONS

Confirmed by N. J. A. Sloane, Dec 17 2011

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Last modified February 15 11:25 EST 2012. Contains 205777 sequences.