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Search: id:A131415
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| 1, 3, 1, 6, 4, 1, 11, 10, 5, 1, 20, 21, 15, 6, 1, 37, 41, 36, 21, 7, 1, 70, 78, 77, 57, 28, 8, 1, 135, 148, 155, 134, 85, 36, 9, 1, 264, 283, 303, 289, 219, 121, 45, 10, 1, 521, 547, 586, 592, 508, 340, 166, 55, 11, 1
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Left column = A006127: (1, 3, 6, 11, 20, 37,...). Row sums = A047859: (1, 4, 11, 27, 63,...).
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FORMULA
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(A007318 * A000012) + (A000012 * A007318) - A007318 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
6, 4, 1;
11, 10, 5, 1;
20, 21, 15, 6, 1;
37, 41, 36, 21, 7, 1;
...
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CROSSREFS
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Cf. A007318, A000012, A006127, A047859.
Sequence in context: A104712 A122177 A108286 this_sequence A121437 A078585 A116551
Adjacent sequences: A131412 A131413 A131414 this_sequence A131416 A131417 A131418
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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), Jul 08 2007
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