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Search: id:A131399
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| 1, 1, 1, 1, 4, 1, 1, 6, 6, 1, 1, 9, 12, 9, 1, 1, 11, 23, 23, 11, 1, 1, 14, 34, 52, 34, 14, 1, 1, 16, 51, 90, 90, 51, 16, 1, 1, 19, 67, 152, 180, 152, 67, 19, 1, 1, 21, 90, 225, 342, 342, 225, 90, 21, 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, 150,...).
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FORMULA
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3*A007318 - A046854 - A065941 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, 6, 6, 1;
1, 9, 12, 9, 1;
1, 11, 23, 23, 11, 1;
1, 14, 34, 52, 34, 14, 1;
1, 16, 51, 90, 90, 51, 16, 1;
...
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CROSSREFS
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Cf. A007318, A046854, A065941, A074878.
Sequence in context: A049702 A132046 A102413 this_sequence A069322 A075112 A046554
Adjacent sequences: A131396 A131397 A131398 this_sequence A131400 A131401 A131402
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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), Jul 05 2007
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