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Search: id:A132787
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| 1, 1, 1, 1, 5, 1, 1, 11, 11, 1, 1, 19, 39, 19, 1, 1, 29, 99, 99, 19, 1, 1, 41, 209, 349, 209, 41, 1, 1, 55, 391, 979, 979, 391, 55, 1, 1, 71, 671, 2351, 3527, 2351, 671, 71, 1, 1, 89, 1079, 5039, 10583, 10583, 5039, 1079, 89, 1
(list; table; graph; listen)
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OFFSET
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1,5
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COMMENT
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Row sums = A132788: (1, 2, 7, 24, 79, 258, 851, 2852,...). Column next to left border of 1's = A018387: (1, 5, 11, 19, 29, 41,...).
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FORMULA
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2*A001263 - A000012 as infinite lower triangular matrices; where A001263 = the Narayana triangle.
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EXAMPLE
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First few rows of the triangle are;
1;
1, 1;
1, 5, 1;
1, 11, 11, 1;
1, 19, 39, 19, 1;
1, 29, 99, 99, 29, 1;
...
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CROSSREFS
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Cf. A001263, A028387.
Sequence in context: A131061 A081578 A082046 this_sequence A119307 A110522 A130227
Adjacent sequences: A132784 A132785 A132786 this_sequence A132788 A132789 A132790
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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), Aug 30 2007
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