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Search: id:A128116
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| 1, 5, 2, 12, 7, 3, 22, 15, 9, 4, 35, 26, 18, 11, 5, 51, 40, 30, 21, 13, 6, 70, 57, 45, 34, 24, 15, 7, 92, 77, 63, 50, 38, 27, 17, 8, 117, 100, 84, 69, 55, 42, 30, 19, 9, 145, 126, 108, 91, 75, 60, 46, 33, 21, 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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Left border of the triangle = A000326, the pentagonal numbers: (1, 5, 12, 22, 35,...) Row sums = A002412: (1, 7, 22, 50, 95,...)
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FORMULA
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A128064 * A122432 (unsigned); where the unsigned version of A122432 = (1; 3, 1; 6, 3, 1; 10, 6, 3, 1;...).
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EXAMPLE
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First few rows of the triangle are:
1;
5, 2;
12, 7, 3;
22, 15, 9, 4;
35, 26, 18, 11, 5;
51, 40, 30, 21, 13, 6;
70, 57, 45, 34, 24, 15, 7;
...
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CROSSREFS
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Cf. A128064, A122432, A000326, A002412.
Sequence in context: A131784 A065268 A130298 this_sequence A082153 A013946 A085436
Adjacent sequences: A128113 A128114 A128115 this_sequence A128117 A128118 A128119
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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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