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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;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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Row sums = A014144 starting (1, 3, 7, 17, 51, 205, ...).
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LINKS
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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:
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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PROG
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(Haskell)
a137948 n k = a137948_tabl !! n !! k
a137948_row n = a137948_tabl !! n
a137948_tabl = zipWith (zipWith div) a245334_tabl a007318_tabl
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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