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Search: id:A158822
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| 1, 3, 1, 6, 3, 2, 10, 6, 5, 3, 15, 10, 9, 7, 4, 21, 15, 14, 12, 9, 5, 28, 21, 20, 18, 15, 11, 6, 36, 28, 27, 25, 22, 18, 13, 7, 45, 36, 35, 33, 30, 26, 21, 15, 8, 55, 45, 44, 42, 39, 35, 30, 24, 17, 9, 66, 55, 54, 52, 49, 45, 40, 34, 27, 19, 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 = A006527: (1, 4, 11, 24, 45, 76, 119,...).
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FORMULA
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Triangle read by rows, A000012 * A158821 * A000012; where A000012 = an infinite lower triangular matrix: (1; 1,1; 1,1,1;...), with all 1's.
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EXAMPLE
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First few rows of the triangle =
1;
3, 1;
6, 3, 2;
10, 6, 5, 3;
15, 10, 9, 7, 4;
21, 15, 14, 12, 9, 5;
28, 21, 10, 18, 15, 11, 6;
36, 28, 27, 25, 22, 18, 13, 7;
45, 36, 35, 33, 30, 26, 21, 15, 8;
55, 45, 44, 42, 39, 35, 30, 24, 17, 9;
66, 55, 54, 52, 49, 45, 40, 34, 27, 19, 10;
78, 66, 65, 63, 60, 56, 51, 45, 38, 30, 21, 11;
91, 78, 77, 75, 72, 68, 63, 57, 50, 42, 33, 23, 12;
...
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CROSSREFS
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Cf. A158821, A006527
Sequence in context: A039805 A094504 A107884 this_sequence A121443 A008795 A165188
Adjacent sequences: A158819 A158820 A158821 this_sequence A158823 A158824 A158825
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KEYWORD
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nonn,tabl,uned
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AUTHOR
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Gary W. Adamson & Roger L. Bagula (qntmpkt(AT)yahoo.com), Mar 28 2009
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