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A036909
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(2/3)*4^n*C(3*n,n).
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0
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8, 160, 3584, 84480, 2050048, 50692096, 1270087680, 32133218304, 819082035200, 21002987765760, 541167892561920, 13999778090188800, 363391162981023744, 9459706464902840320, 246865719056498950144, 6456334894356662059008
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| The right-hand side of a binomial coefficient identity in H. W. Gould, Combinatorial Identities, Morgantown, 1972; Eq. 3.116 page 35.
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FORMULA
| Sum_{k=0..n} C(4n, 2n-2k)C(k+n, n) = (2/3)*4^n*C(3*n, n).
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CROSSREFS
| Sequence in context: A114223 A201030 A127369 * A052140 A184605 A195607
Adjacent sequences: A036906 A036907 A036908 * A036910 A036911 A036912
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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