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Search: id:A132812
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| 1, 2, 2, 3, 9, 3, 4, 24, 24, 4, 5, 50, 100, 50, 5, 6, 90, 300, 300, 90, 6, 7, 147, 735, 1225, 735, 147, 7, 8, 224, 1568, 3920, 3920, 1568, 224, 8, 9, 324, 3024, 10584, 15876, 10584, 3024, 324, 9, 10, 450, 5400, 25200, 52920, 52920, 25200, 540, 450, 10
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A001791 starting (1, 4, 15, 56, 210, 792,...).
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FORMULA
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A127648 * A001263 as infinite lower triangular matrices. a(n) = n * A001263(n,k).
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
3, 9, 3;
4, 24, 24, 4;
5, 50, 100, 50, 5;
6, 90, 300, 300, 90, 6;
...
Row 4 = (4, 24, 24, 4) = 4 * (1, 6, 6, 1), where (1, 6, 6, 1) = row 4 of the Narayana triangle.
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CROSSREFS
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Cf. A001263, A127648, A001791.
Sequence in context: A001131 A019177 A153941 this_sequence A143307 A021821 A019234
Adjacent sequences: A132809 A132810 A132811 this_sequence A132813 A132814 A132815
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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), Sep 01 2007
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