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Search: id:A131899
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| 1, 2, 3, 3, 2, 5, 4, 2, 3, 7, 5, 2, 3, 4, 9, 6, 2, 3, 4, 5, 11, 7, 2, 3, 4, 5, 6, 13, 8, 2, 3, 4, 5, 6, 7, 15, 9, 2, 3, 4, 5, 6, 7, 8, 17, 10, 2, 3, 4, 5, 6, 7, 8, 9, 19
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums = A052905: (1, 5, 10, 16, 23,...)
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FORMULA
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A002260 + A131821 - A000012 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 3;
3, 2, 5;
4, 2, 3, 7;
5, 2, 3, 4, 9;
6, 2, 3, 4, 5, 11;
7, 2, 3, 4, 5, 6, 13;
...
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CROSSREFS
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Cf. A002260, A131821, A052905.
Sequence in context: A034799 A008985 A138652 this_sequence A095174 A131307 A091813
Adjacent sequences: A131896 A131897 A131898 this_sequence A131900 A131901 A131902
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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 25 2007
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