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Search: id:A128177
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| A128177 |
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A128174 * A004736 as infinite lower triangular matrices. n-th row has n non-zero terms of A002620: (1, 2, 4, 6, 9, 12,...) in reverse. |
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+0
1
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| 1, 2, 1, 4, 2, 1, 6, 4, 2, 1, 9, 6, 4, 2, 1, 12, 9, 6, 4, 2, 1, 16, 12, 9, 6, 4, 2, 1, 20, 16, 12, 9, 6, 4, 2, 1, 25, 20, 16, 12, 9, 6, 4, 2, 1, 30, 25, 20, 16, 12, 9, 6, 4, 2, 1
(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 = A002623: (1, 3, 7, 13, 22, 34, 50,...) A002620 = (1, 2, 4, 6, 9, 12, 16, 20, 25, 30,...)
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EXAMPLE
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First few rows of the triangle are:
1;
2, 1;
4, 2, 1;
6, 4, 2, 1;
9, 6, 4, 2, 1;
12, 9, 6, 4, 2, 1;
...
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CROSSREFS
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Cf. A128174, A004736, A002623, A002620.
Sequence in context: A083653 A135152 A147542 this_sequence A087738 A133113 A124840
Adjacent sequences: A128174 A128175 A128176 this_sequence A128178 A128179 A128180
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KEYWORD
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nonn,tabl,more
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Feb 17 2007
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