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A129340
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Triangular array read by rows: for n, k >= 1, a(n+1, 1) = 2*a(n, n); a(n+1, k+1) = a(n, k)+a(n+1, k).
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0
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1, 2, 3, 6, 8, 11, 22, 28, 36, 47, 94, 116, 144, 180, 227, 454, 548, 664, 808, 988, 1215, 2430, 2884, 3432, 4096, 4904, 5892, 7107, 14214, 16644, 19528, 22960, 27056, 31960, 37852, 44959, 89918, 104132, 120776, 140304, 163264, 190320, 222280
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Main diagonal is A035009. First column is A001861.
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FORMULA
| a(n, n) = A035009(n). For k < n, a(n, k) = 2*sum_{i = 1..k} binomial(k-1, i-1)*A035009(n-i).
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CROSSREFS
| Cf. A001861, A035009.
Sequence in context: A127758 A185599 A033766 * A080598 A025053 A140496
Adjacent sequences: A129337 A129338 A129339 * A129341 A129342 A129343
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KEYWORD
| nonn,tabl,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), May 28 2007
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EXTENSIONS
| Edited and extended by David Wasserman (dwasserm(AT)earthlink.net), May 02 2008
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