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1, 2, 1, 3, 0, 1, 5, 1, 0, 1, 5, 0, 0, 0, 1, 9, 1, 1, 0, 0, 1, 7, 0, 0, 0, 0, 0, 1, 12, 1, 0, 1, 0, 0, 0, 1, 11, 0, 1, 0, 0, 0, 0, 0, 1, 15, 1, 0, 0, 1, 0, 0, 0, 0, 1, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 23, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Row sums = sigma(n), A000203: (1, 3, 4, 7, 6, 12, 8,...). Left border = A158901: (1, 2, 3, 5, 5, 9, 7,...).
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FORMULA
| Triangle read by rows, A051731 * A158221; where A051731 = the inverse Mobius transform and A158221 = an infinite lower triangular matrix with (1, 1, 2, 3, 4, 5,...) as the left border and (1, 1, 1,...) as the right border.
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EXAMPLE
| First few rows of the triangle =
1;
2, 1;
3, 0, 1;
5, 1, 0, 1;
5, 0, 0, 0, 1;
9, 1, 1, 0, 0, 1;
7, 0, 0, 0, 0, 0, 1;
12, 1, 0, 1, 0, 0, 0, 1
11, 0, 1, 0, 0, 0, 0, 0, 1;
15, 1, 0, 0, 1, 0, 0, 0, 0, 1;
11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
23, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1;
13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
21, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1;
...
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CROSSREFS
| Cf. A158221, A051731, A158901
Sequence in context: A130026 A113287 A096798 * A137587 A168021 A137639
Adjacent sequences: A158899 A158900 A158901 * A158903 A158904 A158905
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson & Mats Granvik (qntmpkt(AT)yahoo.com), Mar 29 2009
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