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Search: id:A128076
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| 1, 3, 2, 5, 4, 3, 7, 6, 5, 4, 9, 8, 7, 6, 5, 11, 10, 9, 8, 7, 6, 13, 12, 11, 10, 9, 8, 7, 15, 14, 13, 12, 11, 10, 9, 8, 17, 16, 15, 14, 13, 12, 11, 10, 9, 19, 18, 17, 16, 15, 14, 13, 12, 11, 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 = the pentagonal numbers, A000316, starting (1, 5, 12, 22, 35, 51,...). A004736 = (1; 2, 1; 3, 2, 1;...).
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FORMULA
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A128064 * A004736 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 2;
5, 4, 3;
7, 6, 5, 4;
9, 8, 7, 6, 5;
...
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CROSSREFS
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Cf. A128064, A004736, A000326.
Sequence in context: A143956 A110661 A143124 this_sequence A076243 A140061 A061313
Adjacent sequences: A128073 A128074 A128075 this_sequence A128077 A128078 A128079
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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), Feb 14 2007
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