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Search: id:A131252
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| 1, 2, 1, 4, 3, 1, 7, 6, 3, 1, 12, 11, 7, 3, 1, 20, 19, 14, 7, 3, 1, 33, 32, 26, 15, 7, 3, 1, 54, 53, 46, 30, 15, 7, 3, 1, 88, 87, 79, 57, 31, 15, 7, 3, 1, 143, 142, 133, 104, 62, 31, 15, 7, 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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Left border = A000071, Fibonacci numbers - 1, starting with F(3): (1, 2, 4, 7, 12,...). Row sums = A131253: (1, 3, 8, 17, 34, 64, 117,...).
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FORMULA
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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;
2, 1;
4, 3, 1;
7, 6, 3, 1;
12, 11, 7, 3, 1;
20, 19, 14, 7, 3, 1;
33, 32, 26, 15, 7, 3, 1;
...
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CROSSREFS
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Cf. A000071, A000012, A052509, A131253.
Sequence in context: A126570 A048790 A027421 this_sequence A133805 A131254 A134626
Adjacent sequences: A131249 A131250 A131251 this_sequence A131253 A131254 A131255
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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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