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A004332
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a(n) = C(4n,n-2).
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2
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1, 12, 120, 1140, 10626, 98280, 906192, 8347680, 76904685, 708930508, 6540715896, 60403728840, 558383307300, 5166863427600, 47855699958816, 443643407165376, 4116305022165108, 38223742100828400, 355214207837288800
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OFFSET
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2,2
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REFERENCES
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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
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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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FORMULA
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-3*(3*n+2)*(n-2)*(3*n+1)*a(n) + 8*(4*n-3)*(2*n-1)*(4*n-1)*a(n-1) = 0. - R. J. Mathar, May 27 2014
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MATHEMATICA
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Table[Binomial[4n, n-2], {n, 2, 20}] (* Harvey P. Dale, Apr 11 2011 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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