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Search: id:A127466
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| A127466 |
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Triangle read by rows: M * A127093 as infinite lower triangular matrices, where M = matrix with (1, 2, 3,...) in the main diagonal and the rest zeros. |
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+0
5
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| 1, 2, 2, 3, 0, 6, 4, 4, 0, 8, 5, 0, 0, 0, 20, 6, 6, 12, 0, 0, 12, 7, 0, 0, 0, 0, 0, 42, 8, 8, 0, 16, 0, 0, 0, 32, 9, 0, 18, 0, 0, 0, 0, 0, 54, 10, 10, 0, 0, 40, 0, 0, 0, 0, 40
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Also A054522 * A127093 as infinite lower triangular matrices.
Also A054525 * A127481 as infinite lower triangular matrices.
Also Mobius transform of A127481.
Row sums = n^2, right border = n*phi(n), A002618: (1, 2, 6, 8, 20, 12, 42,...).
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
3, 0, 6;
4, 4, 0, 8;
5, 0, 0, 0, 20;
6, 6, 12, 0, 0, 12;
7, 0, 0, 0, 0, 0, 42;
8, 8, 0, 16, 0, 0, 0, 32;
...
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CROSSREFS
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Cf. A054522, A127093, A062952, A002618.
Cf. A127093, A127481, A054525.
Sequence in context: A104594 A079626 A088864 this_sequence A099118 A107098 A071474
Adjacent sequences: A127463 A127464 A127465 this_sequence A127467 A127468 A127469
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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 15 2007
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EXTENSIONS
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This is a merging of three sequences with different definitions but identical terms. It is possible that one or more of these definitions (see Comments lines) really should have had different terms. - N. J. A. Sloane (njas(AT)research.att.com), Aug 23 2007
Edited by N. J. A. Sloane (njas(AT)research.att.com) at the suggestion of Andrew Plewe, Aug 23 2007.
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