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1, 3, 1, 4, 1, 1, 7, 3, 1, 1, 6, 2, 1, 1, 1, 12, 5, 3, 1, 1, 1, 8, 3, 2, 1, 1, 1, 1, 15, 7, 3, 3, 1, 1, 1, 1, 13, 5, 4, 2, 1, 1, 1, 1, 1, 18, 8, 4, 3, 3, 1, 1, 1, 1, 1, 12, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 28, 13, 8, 5, 3, 31, 1, 1, 1, 1, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Left column = sigma(n), A000203.
Row sums = A143356: (1, 4, 56, 12, 11, 23, 17,...).
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FORMULA
| Triangle read by rows, A051731 * A010766, 1<=k<=n
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EXAMPLE
| First few rows of the triangle =
1;
3, 1;
4, 1, 1;
7, 3, 1, 1;
6, 2, 1, 1, 1;
12, 5, 3, 1, 1, 1;
8, 3, 2, 1, 1, 1, 1;
15, 7, 3, 3, 1, 1, 1, 1;
...
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CROSSREFS
| Cf. A051731, A010766, A000203, A143356.
Sequence in context: A130307 A130314 A127057 * A143319 A078011 A010285
Adjacent sequences: A143352 A143353 A143354 * A143356 A143357 A143358
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 10 2008
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