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Search: id:A132118
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| 1, 2, 4, 4, 6, 8, 7, 9, 11, 13, 11, 13, 15, 17, 19, 26, 28, 20, 22, 24, 26, 22, 24, 26, 28, 30, 32, 34, 29, 31, 33, 35, 37, 39, 41, 43, 37, 39, 41, 43, 45, 47, 49, 51, 53, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64
(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 = A002411: (1, 6, 18, 40, 75, 126,...).
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FORMULA
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A000027 + A002260 - A000012 as infinite lower triangular matrices; where A000027 = [1; 2,3; 4,5,6;...]; A002260 = [1; 1,2; 1,2,3;...]; and A000012 = [1; 1,1; 1,1,1;...].
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EXAMPLE
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First few rows of the triangle are:
1;
2, 4;
4, 6, 8;
7, 9, 11, 13;
11, 13, 15, 17, 19;
16, 18, 20, 22, 24, 26;
22, 24, 26, 28, 30, 32, 34;
29, 31, 33, 35, 37, 39 41, 43;
...
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CROSSREFS
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Cf. A002260, A000027, A000012, A002411.
Adjacent sequences: A132115 A132116 A132117 this_sequence A132119 A132120 A132121
Sequence in context: A038669 A135692 A089003 this_sequence A007843 A053196 A002131
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qnttmpkt(AT)yahoo.com), Aug 10 2007
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