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Search: id:A159965
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| A159965 |
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Riordan array (1/sqrt(1-4x), (1-2x-(1-3x)c(x))/(x*sqrt(1-4x))), c(x) the g.f. of A000108. |
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+0
4
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| 1, 2, 1, 6, 5, 1, 20, 21, 8, 1, 70, 84, 45, 11, 1, 252, 330, 220, 78, 14, 1, 924, 1287, 1001, 455, 120, 17, 1, 3432, 5005, 4368, 2380, 816, 171, 20, 1, 12870, 19448, 18564, 11628, 4845, 1330, 231, 23, 1, 48620, 75582, 77520, 54264, 26334, 8855, 2024, 300, 26, 1
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Product of A007318 and A114422. Product of A007318^2 and A116382. Row sums are A108080.
Diagonal sums are A108081.
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FORMULA
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Number triangle T(n,k)=sum{j=0..n, C(n+k,j-k)*C(n,j)}.
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EXAMPLE
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Triangle begins
1,
2, 1,
6, 5, 1,
20, 21, 8, 1,
70, 84, 45, 11, 1,
252, 330, 220, 78, 14, 1,
924, 1287, 1001, 455, 120, 17, 1,
3432, 5005, 4368, 2380, 816, 171, 20, 1
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CROSSREFS
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Sequence in context: A046817 A008970 A055896 this_sequence A116395 A159924 A133367
Adjacent sequences: A159962 A159963 A159964 this_sequence A159966 A159967 A159968
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Apr 28 2009
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