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Search: id:A131327
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| 1, 3, 1, 1, 3, 1, 3, 5, 3, 1, 1, 3, 9, 3, 1, 3, 9, 3, 13, 3, 1, 1, 3, 21, 3, 17, 3, 1, 3, 13, 3, 37, 3, 21, 3, 13, 17, 3, 77, 3, 81, 3, 29, 3, 1
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums = A131328: (1, 4, 5, 12, 17, 32, 49,...).
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FORMULA
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4*A049310 - 3*A000012(signed + - + -... by columns).
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
1, 3, 1;
3, 5, 3, 1;
1, 3, 9, 3, 1;
3, 9, 3, 13, 3, 1;
1, 3, 21, 3, 17, 3, 1;
...
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CROSSREFS
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Cf. A049310, A131328, A131324, A131325, A131326.
Sequence in context: A035691 A131781 A082465 this_sequence A122506 A010274 A137728
Adjacent sequences: A131324 A131325 A131326 this_sequence A131328 A131329 A131330
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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 28 2007
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