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Search: id:A137633
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| 1, 2, 1, 4, 1, 1, 7, 2, 1, 1, 12, 3, 1, 1, 1, 19, 5, 2, 1, 1, 1, 30, 7, 3, 1, 1, 1, 1, 45, 11, 4, 2, 1, 1, 1, 1, 67, 15, 6, 3, 1, 1, 1, 1, 1, 97, 22, 8, 4, 2, 1, 1, 1, 1, 1, 139, 30, 11, 5, 3, 1, 1, 1, 1, 1, 1
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Left border = A000070: (1, 2, 4, 7, 12, 19, 30, 45,...); next column = A000041, the partition numbers: (1, 1, 2, 3, 5, 7, 11,...). Row sums = A016905: (1, 3, 6, 11, 18, 29, 44,...).
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FORMULA
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A000012 * A026794 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 1;
4, 1, 1;
7, 2, 1, 1;
12, 3, 1, 1, 1;
19, 5, 2, 1, 1, 1;
30, 7, 3, 1, 1, 1, 1;
...
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CROSSREFS
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Cf. A000041, A000070, A016905, A026794.
Sequence in context: A055327 A105260 A099510 this_sequence A066633 A088443 A117352
Adjacent sequences: A137630 A137631 A137632 this_sequence A137634 A137635 A137636
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 31 2008
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