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Search: id:A131247
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| 1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 1, 7, 7, 3, 1, 1, 9, 13, 7, 3, 1, 1, 11, 21, 15, 7, 3, 1, 1, 13, 31, 29, 15, 7, 3, 1, 1, 15, 43, 51, 31, 15, 7, 3, 1, 1, 17, 57, 83, 61, 31, 15, 7, 3, 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 = A104161 starting (1, 2, 5, 10, 19, 34, 59,...). Reversal, A131248 is generated from 2*A004070 - A000012.
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FORMULA
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2*A052509 - A000012, where A000012 = (1; 1,1; 1,1,1;...).
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
1, 3, 1;
1, 5, 3, 1;
1, 7, 7, 3, 1;
1, 9, 13, 7, 3, 1;
1, 11, 21, 15, 7, 3, 1;
...
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CROSSREFS
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Cf. A052509, A104161, A004070, A131248.
Adjacent sequences: A131244 A131245 A131246 this_sequence A131248 A131249 A131250
Sequence in context: A014475 A135228 A021325 this_sequence A114278 A134836 A131767
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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 23 2007
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