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Search: id:A130540
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| 1, 3, 1, 4, 0, 1, 7, 3, 0, 1, 6, 0, 0, 0, 1, 12, 4, 3, 0, 0, 1, 8, 0, 0, 0, 0, 0, 1, 15, 7, 0, 3, 0, 0, 0, 1, 13, 0, 4, 0, 0, 0, 0, 0, 1, 18, 6, 0, 0, 3, 0, 0, 0, 0, 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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Left border = A000203, sigma(n): (1, 3, 4, 7, 6,...). Row sums = A007429: (1, 4, 5, 11, 7, 20, 9,...); = inverse Moebius transform applied to sigma(n); (i.e. inverse Moebius transform applied twice to natural numbers).
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FORMULA
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A127093 * A125093^(-1), as infinite lower triangular matrices. Triangle, sigma(n), A000203: (1, 3, 4, 7, 6, 12,...) in every column interspersed with (k-1) zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
4, 0, 1;
7, 3, 0, 1;
6, 0, 0, 0, 1;
12, 4, 3, 0, 0, 1;
8, 0, 0, 0, 0, 0, 1;
...
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CROSSREFS
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Cf. A000203, A007429, A127093, A125093.
Adjacent sequences: A130537 A130538 A130539 this_sequence A130541 A130542 A130543
Sequence in context: A125162 A123730 A143317 this_sequence A076816 A021765 A051512
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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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