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Search: id:A131783
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| 1, 4, 2, 8, 6, 3, 13, 11, 8, 4, 19, 17, 14, 10, 5, 26, 24, 21, 17, 12, 6, 34, 32, 29, 25, 20, 14, 7, 43, 41, 38, 34, 29, 23, 16, 8, 53, 51, 48, 44, 39, 33, 26, 18, 9, 64, 62, 59, 55, 50, 44, 37, 29, 20, 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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Left column = A034856: (1, 4, 8, 13, 19,...). Row sums = A084990: (1, 6, 17, 36, 65, 106,...).
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FORMULA
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A000012 * (A004736 + A002260 - I), I = Identity matrix; A004736 = (1; 2,1; 3,2,1;...); A002260 = (1; 1,2; 1,2,3;...).
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EXAMPLE
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First few rows of the triangle are;
1;
4, 2;
8, 6, 3;
13, 11, 8, 4;
19, 17, 14, 10, 5;
26, 24, 21, 17, 12, 6;
34, 32, 29, 25, 20, 14, 7;
...
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CROSSREFS
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Cf. A004736, A002260, A034856, A084990.
Adjacent sequences: A131780 A131781 A131782 this_sequence A131784 A131785 A131786
Sequence in context: A020806 A030210 A098798 this_sequence A094312 A143942 A125065
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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), Jul 14 2007
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