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A126596
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a(n)=binomial(4*n,n)*(2*n+1)/(3*n+1).
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3
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1, 3, 20, 154, 1260, 10659, 92092, 807300, 7152444, 63882940, 574221648, 5188082354, 47073334100, 428634152730, 3914819231400, 35848190542920, 329007937216860, 3025582795190340, 27872496751392496, 257172019222240200
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..100
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FORMULA
| a(n) = A039599(2*n,n).
a(n) = (2*n+1)*A002293(n) - Mark van Hoeij, Nov 17 2011
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MAPLE
| seq((2*n+1)*binomial(4*n, n)/(3*n+1), n=0..22); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 27 2007
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PROG
| (MAGMA) [Binomial(4*n, n)*(2*n+1)/(3*n+1): n in [0..20]]; // Vincenzo Librandi, Nov 18 2011
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CROSSREFS
| Sequence in context: A154627 A091172 A091168 * A074560 A123355 A192509
Adjacent sequences: A126593 A126594 A126595 * A126597 A126598 A126599
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KEYWORD
| nonn,easy
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Mar 13 2007
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 27 2007
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