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Search: id:A133200
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| A133200 |
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A001263 * A136521 as infinite lower triangular matrices, where A001263 = the Narayana triangle and A136521 = an infinite lower triangular matrix with (1, 2, 2, 2,...) in the main diagonal and the rest zeros. |
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+0
1
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| 1, 1, 2, 1, 6, 2, 1, 12, 12, 2, 1, 20, 40, 20, 2, 1, 30, 100, 100, 30, 2, 1, 42, 210, 350, 210, 42, 2, 1, 56, 392, 980, 980, 392, 56, 2, 1, 72, 672, 2352, 3528, 2352, 672, 72, 2, 1, 90, 1080, 5040, 10584, 10584, 5040, 1080, 90, 2
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Row sums = A131428 starting (1, 3, 9, 27, 83, 263,...).
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EXAMPLE
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First few rows of the triangle are:
1;
1, 2;
1, 6, 2;
1, 12, 12, 2;
1, 20, 40, 20, 2;
1, 30, 100, 100, 30, 2;
1, 42, 210, 350, 210, 42, 2;
...
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CROSSREFS
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Cf. A001263, A136521.
Sequence in context: A083720 A055878 A030304 this_sequence A103881 A101024 A124730
Adjacent sequences: A133197 A133198 A133199 this_sequence A133201 A133202 A133203
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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), Jan 02 2008
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