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A097322 (2n)! divided by denominator of Taylor expansion of exp(cos(x)-1). 1
1, 4, 1, 1, 4, 1, 1, 4, 1, 11, 4, 1, 1, 4, 11, 1, 4, 31, 1, 44, 29, 1, 4, 1, 11, 4, 29, 1, 4, 11, 1, 4, 31, 1, 1276, 1, 41, 4, 1, 11, 116, 1, 1, 292, 11, 1, 4, 31, 127571, 44, 1, 1, 4, 1, 319, 4, 41, 1, 4, 11, 1, 4, 899, 1, 44, 1, 1, 4, 29, 11, 4, 1, 1, 4, 583, 1, 4756, 361429 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

PROG

(PARI) a(n)=(2*n)!/denominator(polcoeff(Ser(exp(cos(x)-1)), 2*n))

CROSSREFS

Equals A010050(n) / A047690(n).

Cf. A005046.

Sequence in context: A014518 A146325 A069289 * A177023 A080278 A070085

Adjacent sequences:  A097319 A097320 A097321 * A097323 A097324 A097325

KEYWORD

nonn,easy

AUTHOR

Ralf Stephan, Aug 08 2004

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Last modified February 13 14:31 EST 2012. Contains 205511 sequences.