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1, 4, 26, 232, 2620, 35696, 568504, 10349536, 211799312, 4809701440, 119952692896, 3257843882624, 95680443760576, 3020676745975552, 101990226254706560, 3666624057550245376, 139813029266338603264
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| n!*2^n*LaguerreL(n, 1/2, -1/2). - Vladeta Jovovic (vladeta(AT)eunet.rs), May 10 2003
a(n)=sum(n!*(2^(n-m))*binomial(n+1/2,n-m)/m!,m=0..n), n>=0.
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MAPLE
| a := proc(n) option remember: if n = 0 then RETURN(1) fi: if n = 1 then RETURN(1) fi: a(n-1)+(n-1)*a(n-2): end: for i from 1 to 61 by 2 do printf(`%d, `, a(i)) od:
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CROSSREFS
| Cf. A066223.
Unsigned row sums of A130757.
Sequence in context: A168448 A105616 A107879 * A136227 A000310 A054360
Adjacent sequences: A066221 A066222 A066223 * A066225 A066226 A066227
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 19 2001
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EXTENSIONS
| More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Feb 11, 2002
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