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Search: id:A009120
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| 1, 12, 1680, 665280, 518918400, 670442572800, 1295295050649600, 3497296636753920000, 12576278705767096320000, 58102407620643984998400000, 335367096786357081410764800000
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OFFSET
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0,2
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COMMENT
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Expansion of cos(x^2).
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FORMULA
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Integral representation as n-th moment of a positive function on a positive half-axis, in Maple notation: a(n)=int((1/4)*exp(-1/4*sqrt(x))/(sqrt(Pi)*x^(3/4)), x=0..infinity), n=0, 1... - Karol A. Penson (penson(AT)lptl.jussieu.fr), Sep 19 2001
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MATHEMATICA
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Cos[ x^2 ] (* [ x^(4n) ] *)
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CROSSREFS
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Equals 4^n * A1002992(n).
Sequence in context: A015011 A034280 A146201 this_sequence A078928 A013717 A015485
Adjacent sequences: A009117 A009118 A009119 this_sequence A009121 A009122 A009123
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KEYWORD
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nonn,easy
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AUTHOR
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R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
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Extended by Olivier Gerard, Mar 01, 1997
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