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Search: id:A054143
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| A054143 |
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Triangular array T given by T(n,k)=Sum{C(i,j): 0<=j<=i-n+k, n-k<=i<=n}. |
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4
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| 1, 1, 3, 1, 4, 7, 1, 5, 11, 15, 1, 6, 16, 26, 31, 1, 7, 22, 42, 57, 63, 1, 8, 29, 64, 99, 120, 127, 1, 9, 37, 93, 163, 219, 247, 255, 1, 10, 46, 130, 256, 382, 466, 502, 511, 1, 11, 56, 176, 386, 638, 848, 968, 1013, 1023, 1, 12, 67, 232
(list; table; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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Rows: {1}, {1,3}, {1,4,7}, {1,5,11,15}, ...
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CROSSREFS
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Row sums given by A001787, T(n, n)=-1+2^(n+1), T(2n, n)=4^n.
T(2n+1, n)=A000346(n), T(2n-1, n)=A032443(n).
Diagonal sums give A005672. - Paul Barry (pbarry(AT)wit.ie), Feb 07 2003
Adjacent sequences: A054140 A054141 A054142 this_sequence A054144 A054145 A054146
Sequence in context: A028861 A081521 A086273 this_sequence A104746 A081255 A005371
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KEYWORD
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nonn,tabl
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu), Mar 18 2000
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