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Search: id:A137948
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| 1, 2, 1, 3, 2, 2, 4, 3, 4, 6, 5, 4, 6, 12, 24, 6, 5, 8, 18, 48, 120, 7, 6, 10, 24, 72, 240, 720, 8, 7, 12, 30, 96, 360, 1440, 5040, 9, 8, 14, 36, 120, 480, 2160, 10080, 40320, 10, 9, 16, 42, 144, 600, 2880, 15120, 80640, 362880
(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 = A014144 starting (1, 3, 7, 17, 51, 205,...).
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FORMULA
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As infinite lower triangular matrices, A000012 * A136579, where A000012 = (1; 1,1; 1,1,1;...) and A136579 = (1; 1,1; 1,1,2; 1,1,2,6; 1,1,2,6,24;...).
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EXAMPLE
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First few rows of the triangle are:
1;
2, 1;
3, 2, 2;
4, 3, 4, 6;
5, 4, 6, 12, 24;
6, 5, 8, 18, 48, 120;
7, 6, 10, 24, 72, 240, 720;
...
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CROSSREFS
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Cf. A136579, A014144.
Sequence in context: A132923 A144329 A141157 this_sequence A120933 A064134 A144154
Adjacent sequences: A137945 A137946 A137947 this_sequence A137949 A137950 A137951
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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), Feb 28 2008
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