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Search: id:A140750
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| A140750 |
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Triangle read by rows, X^n * [1,0,0,0,...]; where X = an infinite tridiagonal matrix with (1,0,1,0,1,...) in the main and subsubdiagonals and (1,1,1,...) in the subdiagonal. |
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+0
3
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| 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 5, 3, 5, 1, 1, 1, 1, 7, 5, 13, 5, 7, 1, 1, 1, 1, 9, 7, 25, 13, 25, 7, 9, 1, 1, 1, 1, 11, 9, 41, 25, 63, 25, 41, 9, 11, 1, 1, 1, 1, 13, 11, 61, 41, 129, 63, 129, 41, 61, 11, 13, 1, 1
(list; table; graph; listen)
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OFFSET
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1,7
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COMMENT
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Row sums = A001333 starting (1, 3, 7, 17, 41, 99, 239,...).
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1, 1;
1, 1, 3, 1, 1;
1, 1, 5, 3, 5, 1, 1;
1, 1, 7, 5, 13, 5, 7, 1, 1;
1, 1, 9, 7, 25, 13, 25, 7, 9, 1, 1;
1, 1, 11, 9, 41, 25, 63, 25, 41, 9, 11, 1, 1;
1, 1, 13, 11, 61, 41, 129, 63, 129, 41, 61, 11, 13, 1, 1;
...
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CROSSREFS
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Cf. A001333, A140751.
Sequence in context: A131324 A079724 A111368 this_sequence A028264 A010122 A058663
Adjacent sequences: A140747 A140748 A140749 this_sequence A140751 A140752 A140753
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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 26 2008
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