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Search: id:A128489
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| 1, 3, 1, 6, 1, 1, 10, 3, 1, 1, 1, 15, 3, 1, 1, 1, 21, 6, 3, 1, 1, 1, 28, 6, 3, 1, 1, 1, 1, 36, 10, 3, 3, 1, 1, 1, 1, 45, 10, 6, 3, 1, 1, 1, 1, 1, 55, 15, 6, 3, 3, 1, 1, 1, 1, 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 = A024916: (1, 4, 8, 15, 21, 33,...)
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FORMULA
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A000012 * A126988 as infinite lower triangular matrices. By columns, k=1,2,3,...; k repeated terms of the triangular series, (1, 3, 6, 10,...) in the k-th column.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
6, 1, 1;
10, 3, 1, 1;
15, 3, 1, 1, 1;
21, 6, 3, 1, 1, 1;
28, 6, 3, 1, 1, 1, 1;
36, 10, 3, 3, 1, 1, 1, 1;
45, 10, 6, 3, 1, 1, 1, 1, 1;
...
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CROSSREFS
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Cf. A000012, A126988, A024916, A000216.
Sequence in context: A124846 A099512 A127096 this_sequence A130541 A034839 A089732
Adjacent sequences: A128486 A128487 A128488 this_sequence A128490 A128491 A128492
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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 04 2007
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