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Search: id:A128623
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| 1, 2, 2, 6, 3, 3, 8, 8, 4, 4, 15, 10, 10, 5, 5, 18, 18, 12, 12, 6, 6, 28, 21, 21, 14, 14, 7, 7, 32, 32, 24, 24, 16, 16, 8, 8, 45, 36, 36, 27, 18, 18, 9, 9, 50, 50, 40, 40, 30, 30, 20, 20, 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 = A128624
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FORMULA
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A128621 * 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;
6, 3, 3;
8, 8, 4, 4;
15, 10, 10, 5, 5;
18, 18, 12, 12, 6, 6;
28, 21, 21, 14, 14, 7, 7;
...
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CROSSREFS
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Cf. A128621, A000012, A128624.
Sequence in context: A100346 A130478 A163890 this_sequence A085738 A100641 A028421
Adjacent sequences: A128620 A128621 A128622 this_sequence A128624 A128625 A128626
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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 14 2007
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