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Search: id:A128590
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| 1, 2, 2, 4, 3, 3, 6, 6, 4, 4, 9, 8, 8, 5, 5, 12, 12, 10, 6, 6, 16, 15, 15, 12, 12, 7, 7, 20, 20, 18, 18, 14, 14, 8, 8, 25, 24, 24, 21, 21, 16, 16, 9, 9, 30, 30, 28, 28, 24, 24, 18, 18, 10, 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 tetrahedral numbers, A000292, starting (1, 4, 10, 20, 35, 56, 84,...)
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FORMULA
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A128179 * A000012 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
4, 3, 3;
6, 6, 4, 4;
9, 8, 8, 5, 5;
12, 12, 10, 6, 6;
16, 15, 15, 12, 12, 7, 7;
...
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CROSSREFS
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Cf. A128179, A000012, A000292.
Sequence in context: A122687 A002948 A117113 this_sequence A131052 A051297 A078317
Adjacent sequences: A128587 A128588 A128589 this_sequence A128591 A128592 A128593
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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), Mar 11 2007
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