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Search: id:A130541
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| 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
(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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A002260 * A125093^(-1) as infinite lower triangular matrices. k repeats of the triangular series A000217 (1, 3, 6, 10,...) in k-th column, where (1, 3, 6,...) = left border counting as 1 repeat.
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EXAMPLE
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First few rows of the triangle =
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;
...
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CROSSREFS
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Cf. A000217, A002260, A024916, A125093.
Sequence in context: A099512 A127096 A128489 this_sequence A034839 A089732 A098076
Adjacent sequences: A130538 A130539 A130540 this_sequence A130542 A130543 A130544
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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), Jun 03 2007
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