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Search: id:A144736
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| 1, 2, 1, 2, 0, 2, 3, 0, 2, 2, 2, -2, 1, 1, 4, 4, -2, 3, 0, 5, 2, 2, -4, 0, -1, 4, 1, 6, 4, -5, 2, -1, 4, 1, 6, 4, 3, -6, 1, -3, 4, -2, 6, 4, 6, 4, -8, 0, -4, 8, -3, 7, 3, 7, 4, 2, -8, -2, -6, 3, -4, 6, 2, 6, 3, 10
(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 = sigma(n), A000203.
Right border = phi(n), A000010
Left border = d(n), A000005
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FORMULA
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Triangle read by rows, A051731 * A000012 * A051731 * A054533; as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle =
1;
2, 1;
2, 0, 2;
3, 0, 2, 2;
2, -2, 1, 1, 4;
4, -2, 3, 0, 5, 2;
2, -4, 0, -1, 4, 1, 6;
4, -5, 2, -1, 4, 1, 6, 4;
3, -6, 1, -3, 4, -2, 6, 4, 6;
4, -8, 0, -4, 8, -3, 7, 3, 7, 4;
...
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CROSSREFS
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A054533, Cf. A000203, A000005, A000010, A051731
Sequence in context: A117448 A093321 A046144 this_sequence A137423 A127471 A071485
Adjacent sequences: A144733 A144734 A144735 this_sequence A144737 A144738 A144739
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KEYWORD
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tabl,sign
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 20 2008
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