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Search: id:A128417
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| A128417 |
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Number triangle T(n,k)=2^(n-k)*C(2n,n-k). |
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+0
5
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| 1, 4, 1, 24, 8, 1, 160, 60, 12, 1, 1120, 448, 112, 16, 1, 8064, 3360, 960, 180, 20, 1, 59136, 25344, 7920, 1760, 264, 24, 1, 439296, 192192, 64064, 16016, 2912, 364, 28, 1, 3294720, 1464320
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Inverse of A128414. Row sums are A128418. Diagonal sums are A128419.
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FORMULA
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Riordan array (1/sqrt(1-8x),(1-4x-sqrt(1-8x)/(8x)); T(n,k)=2^(n-k)*A094527(n,k).
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EXAMPLE
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1,
4, 1,
24, 8, 1,
160, 60, 12, 1,
1120, 448, 112, 16, 1,
8064, 3360, 960, 180, 20, 1,
59136, 25344, 7920, 1760, 264, 24, 1,
439296, 192192, 64064, 16016, 2912, 364, 28, 1
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CROSSREFS
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Cf. A128413.
Sequence in context: A057869 A166027 A158978 this_sequence A136232 A079621 A046860
Adjacent sequences: A128414 A128415 A128416 this_sequence A128418 A128419 A128420
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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), Mar 02 2007
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