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Search: id:A135837
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| A135837 |
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A007318 * a triangle with (1, 2, 2, 4, 4, 8, 8,...) in the main diagonal and the rest zeros. |
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+0
3
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| 1, 1, 2, 1, 4, 2, 1, 6, 6, 4, 1, 8, 12, 16, 4, 1, 10, 20, 40, 20, 8, 1, 12, 30, 80, 60, 48, 8, 1, 14, 42, 140, 140, 168, 56, 16, 1, 16, 56, 224, 280, 448, 224, 128, 16, 1, 18, 72, 336, 504, 1008, 672, 576, 144, 32
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Row sums = A001333 starting (1, 3, 7, 17, 41, 99, 239,...).
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FORMULA
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Binomial transform of a triangle with (1, 2, 2, 4, 4, 8, 8,...) in the main diagonal and the rest zeros.
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EXAMPLE
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First few rows of teh triangle are:
1;
1, 2;
1, 4, 2;
1, 6, 6, 4;
1, 8, 12, 16, 4;
1, 10, 20, 40, 20, 8;
1, 12, 30, 80, 60, 48, 8;
...
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CROSSREFS
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Cf. A001333, A135838.
Sequence in context: A124840 A124927 A126279 this_sequence A027144 A035607 A059370
Adjacent sequences: A135834 A135835 A135836 this_sequence A135838 A135839 A135840
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KEYWORD
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nice,nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 01 2007
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