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A066211
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Sum((2*n)!/(2*n-j)!,j=0..n).
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1
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1, 3, 17, 157, 2081, 36101, 773665, 19726085, 582913217, 19582414021, 736891600001, 30699450566885, 1402556105125345, 69719685409234277, 3745929254826233441, 216310377722912693701, 13359435408855851031425, 878701820865582786218885
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=0,...,100
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PROG
| (PARI) { for (n=0, 100, s=0; for (j=0, n, s+=(2*n)!/(2*n - j)!); write("b066211.txt", n, " ", s) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Feb 06 2010]
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CROSSREFS
| Sequence in context: A168441 A001469 A110501 * A163884 A175607 A052143
Adjacent sequences: A066208 A066209 A066210 * A066212 A066213 A066214
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 17 2001
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