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A126079
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G.f.: (1-2*x)*sqrt(1-4*x).
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1
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1, -4, 2, 0, -2, -8, -28, -96, -330, -1144, -4004, -14144, -50388, -180880, -653752, -2377280, -8691930, -31935960, -117858900, -436698240, -1623971580, -6059188080, -22676052360, -85100059200, -320188972740, -1207569840048, -4564276213608, -17286920538496, -65597689543400
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=binom(2n,n)-6*binom(2n-2,n-1)+8*binom(2n-4,n-2). a(n)=(3-n)binomial(2n,n)/[(2n-3)(2n-1)]. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 25 2007
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MAPLE
| a:=n->(3-n)*binomial(2*n, n)/(2*n-3)/(2*n-1): seq(a(n), n=0..30); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 25 2007
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CROSSREFS
| Cf. A126966, A126089.
Sequence in context: A164789 A028956 A129681 * A106220 A176066 A104689
Adjacent sequences: A126076 A126077 A126078 * A126080 A126081 A126082
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 22 2007
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