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Search: id:A131053
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| 1, 1, 2, 2, 2, 3, 2, 6, 3, 4, 3, 6, 13, 4, 5, 3, 12, 13, 24, 5, 6, 4, 12, 34, 24, 40, 6, 7, 4, 20, 34, 80, 40, 62, 7, 8, 5, 20, 70, 80, 166, 62, 91, 8, 9
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Row sums = (2^n - 1): (1, 3, 7, 15,...). Left border = A004526: (1, 1, 2, 2, 3, 3,...). A131052 = A131047 * A000012.
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FORMULA
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A000012 * A131047 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 2;
2, 2, 3;
2, 6, 3, 4;
3, 6, 13, 4, 5;
3, 12, 13, 24, 5, 6;
4, 12, 34, 24, 40, 6, 7;
...
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CROSSREFS
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Cf. A131047, A000012, A131052, A004526.
Sequence in context: A058726 A132321 A122765 this_sequence A125600 A084053 A071452
Adjacent sequences: A131050 A131051 A131052 this_sequence A131054 A131055 A131056
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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), Jun 12 2007
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