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Search: id:A131421
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| 1, 3, 5, 5, 7, 9, 7, 9, 11, 13, 9, 11, 13, 15, 17, 11, 13, 15, 17, 19, 21, 13, 15, 17, 19, 21, 23, 25, 15, 17, 19, 21, 23, 25, 27, 29, 17, 19, 21, 23, 25, 27, 39, 31, 33, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37
(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 = A000567, the octagonal numbers: (1, 8, 21, 40, 65, 96,...).
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FORMULA
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(A000012 * A127775) + (A127775 * A000012) - A000012; as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 5;
5, 7, 9;
7, 9, 11, 13;
9, 11, 13, 15, 17;
11, 13, 15, 17, 19, 21;
13, 15, 17, 19, 21, 23, 25;
...
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CROSSREFS
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Cf. A127775, A000567.
Sequence in context: A088081 A138475 A023840 this_sequence A088743 A122800 A063202
Adjacent sequences: A131418 A131419 A131420 this_sequence A131422 A131423 A131424
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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 10 2007
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