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Search: id:A135853
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| 1, 4, 2, 6, 6, 3, 8, 12, 12, 4, 10, 20, 30, 20, 5, 12, 30, 60, 60, 30, 6, 14, 42, 105, 140, 105, 42, 7, 16, 56, 168, 280, 280, 168, 56, 8, 18, 72, 252, 504, 630, 504, 252, 72, 9, 20, 90, 360, 840, 1260, 1260, 840, 360, 90, 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 = A135854: (1, 6, 15, 36, 85, 198, 455,...). A135852 = A007318 * A103516.
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FORMULA
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A103516 * A007318 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
4, 2;
6, 6, 3;
8, 12, 12, 4;
10, 20, 30, 20, 5;
12, 30, 60, 60, 30, 6;
14, 42, 105, 140, 105, 42, 7;
...
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CROSSREFS
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Cf. A103516, A135854, A135852.
Sequence in context: A161912 A162339 A021705 this_sequence A138947 A083412 A086399
Adjacent sequences: A135850 A135851 A135852 this_sequence A135854 A135855 A135856
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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), Dec 01 2007
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