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A073306
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Product_{2i<n} binomial(2*n-2*i-1,2*i).
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0
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1, 1, 1, 3, 10, 105, 1260, 48510, 2162160, 312161850, 52562109600, 28836887379300, 18539497049673600, 38989721014029185400, 96410946507417622080000, 782067521015701609508820000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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MATHEMATICA
| Table[Product[Binomial[2n-2i-1, 2i], {i, Floor[(n-1)/2]}], {n, 0, 20}] (* From Harvey P. Dale, Nov 29 2011 *)
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PROG
| (PARI) a(n)=prod(i=0, (n-1)\2, binomial(2*n-2*i-1, 2*i))
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CROSSREFS
| a(n)=A055068(n, n).
Sequence in context: A091342 A093454 A048531 * A034945 A132480 A201694
Adjacent sequences: A073303 A073304 A073305 * A073307 A073308 A073309
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KEYWORD
| nonn,easy
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AUTHOR
| Michael Somos, Jul 24, 2002
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