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Search: id:A140767
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| A140767 |
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Triangle read by rows, X^n * [1,1,0,0,0,...] where X = a tridiagonal matrix with (1,1,1,...) in the main and subdiagonals and (1,0,1,0,1,...) in the subsubdiagonal. |
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+0
1
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| 1, 1, 1, 2, 2, 1, 3, 5, 2, 2, 1, 4, 9, 7, 9, 2, 2, 1, 5, 14, 16, 25, 11, 13, 2, 2, 1, 6, 20, 30, 55, 36, 49, 15, 17, 2, 2, 1, 7, 27, 50, 105, 91, 140, 64, 81, 19, 21, 2, 2, 1, 8, 35, 77, 182, 196, 336, 204, 285, 100, 121, 23, 25, 2, 2
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Row sums = odd indexed Fibonacci numbers starting (2, 5, 13, 34, 89,...).
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EXAMPLE
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First few rows of the triangle are:
1, 1;
1, 2, 2;
1, 3, 5, 2, 2;
1, 4, 9, 7, 9, 2, 2;
1, 5, 14, 16, 25, 11, 13, 2, 2;
1, 6, 20, 30, 55, 36, 49, 15, 17, 2, 2;
1, 7, 27, 50, 105, 91, 140, 64, 81, 19, 21, 2, 2;
...
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CROSSREFS
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Sequence in context: A111375 A046752 A086350 this_sequence A060850 A038137 A073133
Adjacent sequences: A140764 A140765 A140766 this_sequence A140768 A140769 A140770
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson & Roger L. Bagula (qntmpkt(AT)yahoo.com), May 28 2008
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