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1, 3, 3, 5, 6, 5, 7, 9, 9, 7, 9, 12, 14, 12, 9, 11, 15, 20, 20, 15, 11, 13, 18, 27, 32, 27, 18, 13, 15, 21, 35, 49, 49, 35, 21, 15, 17, 24, 44, 72, 86, 72, 44, 24, 17, 19, 27, 54, 102, 144, 144, 102, 54, 27, 19
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums = A131949: (1, 6, 16, 32, 56, 91, 148, 240,...).
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FORMULA
| 2*A002024 + A007318 - 2*A000012 as infinite lower triangular matrices.
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EXAMPLE
| First few rows of the triangle are:
1;
3, 3;
5, 6, 5;
7, 9, 9, 7;
9, 12, 14, 12, 9;
11, 15, 20, 20, 15, 11;
13, 18, 27, 32, 27, 18, 13;
15, 21, 35, 49, 49, 35, 21, 15;
...
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CROSSREFS
| Cf. A002024, A007318, A131949.
Sequence in context: A140351 A128444 A204250 * A134636 A088564 A161560
Adjacent sequences: A131945 A131946 A131947 * A131949 A131950 A131951
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 30 2007
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