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Search: id:A131901
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| 1, 2, 2, 3, 5, 3, 4, 7, 7, 4, 5, 9, 9, 9, 5, 6, 11, 11, 11, 11, 6, 7, 13, 13, 13, 13, 13, 7, 8, 15, 15, 15, 15, 15, 15, 8, 9, 17, 17, 17, 17, 17, 17, 17, 9, 10, 19, 19, 19, 19, 19, 19, 19, 19, 10
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A084849: (1, 4, 11, 22, 37,...).
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FORMULA
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2*A002024 - A131821 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
3, 5, 3;
4, 7, 7, 4;
5, 9, 9, 9, 5;
6, 11, 11, 11, 11, 6;
7, 13, 13, 13, 13, 13, 7;
...
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CROSSREFS
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Cf. A002024, A131821, A084849.
Sequence in context: A053811 A049840 A072039 this_sequence A132071 A061177 A129312
Adjacent sequences: A131898 A131899 A131900 this_sequence A131902 A131903 A131904
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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 26 2007
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