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Search: id:A131239
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| 1, 1, 1, 1, 4, 1, 1, 5, 7, 1, 1, 8, 12, 10, 1, 1, 9, 24, 22, 13, 1, 1, 12, 33, 52, 35, 16, 1, 1, 13, 51, 85, 95, 51, 19, 1, 1, 16, 64, 148, 180, 156, 70, 22, 1, 1, 17, 88, 212, 348, 336, 238, 92, 25, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Row sums = A074878: (1, 2, 6, 14, 32, 70, 239,...). A131238 = 2*A007318 - A046854.
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FORMULA
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3*A007318 - 2*A046854 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
1, 4, 1;
1, 5, 7, 1;
1, 8, 12, 10, 1;
1, 9, 24, 22, 13, 1;
1, 12, 33, 52, 35, 16, 1;
...
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CROSSREFS
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Cf. A007318, A046854, A131238, A074878.
Sequence in context: A146770 A143334 A136489 this_sequence A114033 A084061 A140262
Adjacent sequences: A131236 A131237 A131238 this_sequence A131240 A131241 A131242
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jun 21 2007
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