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Search: id:A024343
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| 2, -120, 30240, -17297280, 17643225600, -28158588057600, 64764752532480000, -202843204931727360000, 830034394580628357120000, -4299578163927654889881600000, 27500101936481280675682713600000
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OFFSET
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0,1
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COMMENT
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Absolute values are coefficients of expansion of sinh(x^2).
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FORMULA
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(-1)^n * (4n+2)! / (2n+1)!.
E.g.f.: Sin[ x^2 ] (* [ x^(4n+2) ] *)
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PROGRAM
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(PARI) a(n)=polcoeff(serlaplace(sin(x^2)), 4*n+2)
(PARI) a(n)=(-1)^n*(4*n+2)!/(2*n+1)!
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CROSSREFS
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Bisection of A001813.
Adjacent sequences: A024340 A024341 A024342 this_sequence A024344 A024345 A024346
Sequence in context: A073785 A102355 A077540 this_sequence A100043 A100012 A042799
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin (rhh(AT)cadence.com)
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EXTENSIONS
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Extended with signs Mar 15 1997 by Olivier Gerard.
Edited by Ralf Stephan, Mar 25 2004
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