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Search: id:A127570
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| 1, 1, 3, 1, 0, 4, 1, 3, 0, 7, 1, 0, 0, 0, 6, 1, 3, 4, 0, 0, 12, 1, 0, 0, 0, 0, 0, 8, 1, 3, 0, 7, 0, 0, 0, 15, 1, 0, 4, 0, 0, 0, 0, 0, 13, 1, 3, 0, 0, 6, 0, 0, 0, 0, 18
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Right border = sigma(n), A000203; row sums = A007429, (1, 4, 5, 11, 7, 20, 9,...).
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FORMULA
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Inverse Mobius transform of infinite lower triangular matrix S, S = sigma(n), A000203, in the main diagonal and the rest zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 3;
1, 0, 4;
1, 3, 0, 7;
1, 0, 0, 0, 6;
1, 3, 4, 0, 0, 12;
...
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CROSSREFS
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Cf. A000203, A007429, A051731.
Sequence in context: A159059 A127569 A117372 this_sequence A045406 A143468 A133728
Adjacent sequences: A127567 A127568 A127569 this_sequence A127571 A127572 A127573
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KEYWORD
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nonn,tabl,uned
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 19 2007
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