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1, 1, 1, 1, 3, 1, 1, 4, 4, 1, 1, 6, 7, 6, 1, 7, 14, 14, 7, 1, 1, 9, 20, 33, 20, 9, 11, 10, 31, 56, 56, 31, 10, 1, 1, 12, 40, 97, 111, 97, 40, 12, 1, 1, 13, 55, 142, 217, 217, 142, 55, 13, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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COMMENTS
| Row sums = A131403: (1, 2, 5, 10, 21, 44, 93,...).
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FORMULA
| 2*A007318 - (A046854 + A065941 - A000012) as infinite lower triangular matrices.
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EXAMPLE
| First few rows of the triangle are:
1;
1, 1;
1, 3, 1;
1, 4, 4, 1;
1, 6, 7, 6, 1;
1, 7, 14, 14, 7, 1;
1, 9, 20, 33, 20, 9, 1;
1, 10, 31, 56, 56, 31, 10, 1;
...
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CROSSREFS
| Cf. A046854, A065941, A131403.
Sequence in context: A013580 A147290 A026670 * A026626 A136482 A026648
Adjacent sequences: A131399 A131400 A131401 * A131403 A131404 A131405
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 07 2007
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