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A004321
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Binomial coefficient C(3n,n-3).
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1
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1, 12, 105, 816, 5985, 42504, 296010, 2035800, 13884156, 94143280, 635745396, 4280561376, 28760021745, 192928249296, 1292706174900, 8654327655120, 57902201338905, 387221678682300, 2588713818544245
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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REFERENCES
| M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 828.
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LINKS
| Milan Janjic, Two Enumerative Functions
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
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MAPLE
| a:=n->sum(binomial(2*n-2, n+j)*binomial(n-1, n-j+1), j=0..n): seq(a(n), n=4..22); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 29 2007
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CROSSREFS
| Sequence in context: A094530 A157024 A051815 * A016223 A027142 A090816
Adjacent sequences: A004318 A004319 A004320 * A004322 A004323 A004324
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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