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Search: id:A127506
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| 1, 1, 0, 1, 1, 0, 1, 0, 2, 0, 1, 1, 2, 2, 0, 1, 0, 0, 0, 4, 0, 1, 1, 2, 2, 4, 2, 0, 1, 0, 2, 0, 4, 0, 6, 0, 1, 1, 0, 2, 4, 0, 6, 4, 0, 1, 0, 2, 0, 0, 0, 6, 0, 6, 0
(list; table; graph; listen)
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OFFSET
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1,9
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COMMENT
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Row sums = A053570.
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FORMULA
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A054521 * M, as infinite lower triangular matrices; M = phi(n) 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, 0;
1, 1, 0;
1, 0, 2, 0;
1, 1, 2, 2, 0;
1, 0, 0, 0, 4, 0;
1, 1, 2, 2, 4, 2, 0;
...
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CROSSREFS
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Cf. A054521, A000010, A053570.
Sequence in context: A025866 A048881 A026931 this_sequence A007968 A077763 A030218
Adjacent sequences: A127503 A127504 A127505 this_sequence A127507 A127508 A127509
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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), Jan 17 2007
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 09 2008
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