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Search: id:A128179
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| 1, 0, 2, 1, 0, 3, 0, 2, 0, 4, 1, 0, 3, 0, 5, 0, 2, 0, 4, 0, 6, 1, 0, 3, 0, 5, 0, 7, 0, 2, 0, 4, 0, 6, 0, 8, 1, 0, 3, 0, 5, 0, 7, 0, 9, 0, 2, 0, 4, 0, 6, 0, 8, 0, 10
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Row sums = A002620: (1, 2, 4, 6, 9, 12, 16, 20, 25, 30,...)
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FORMULA
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A097807 * A002260 as infinite lower triangular matrices. k-th column = (k, 0, k, 0,...).
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EXAMPLE
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First few rows of the triangle are:
1;
0, 2;
1, 0, 3;
0, 2, 0, 4;
1, 0, 3, 0, 5;
0, 2, 0, 4, 0, 6;
1, 0, 3, 0, 5, 0, 7;
...
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CROSSREFS
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Cf. A097807, A002260, A002620.
Sequence in context: A014405 A143153 A127448 this_sequence A058558 A123973 A098493
Adjacent sequences: A128176 A128177 A128178 this_sequence A128180 A128181 A128182
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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 17 2007
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