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Search: id:A158841
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| 1, 3, 1, 7, 4, 2, 13, 9, 6, 3, 21, 16, 12, 8, 4, 31, 25, 20, 15, 10, 5, 43, 36, 30, 24, 18, 12, 6, 57, 49, 42, 35, 28, 21, 14, 7, 73, 64, 56, 48, 40, 32, 24, 16, 8, 91, 81, 72, 63, 54, 45, 36, 27, 18, 9
(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 = A158842: (1, 4, 13, 31, 61, 106, 169,...) Left border = A002061: (1, 3, 7, 13, 21, 31, 43,...).
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FORMULA
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Triangle read by rows, A158821 * A004736; where A004736 = an infinite lower triangular matrix with (1,2,3,...) in every column
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EXAMPLE
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First few rows of the triangle =
1;
3, 1;
7, 4, 2;
13, 9, 6, 3;
21, 16, 12, 8, 4;
31, 25, 20, 15, 10, 5;
43, 36, 30, 24, 18, 12, 6;
57, 49, 42, 35, 28, 21, 14, 7;
73, 64, 56, 48, 40, 32, 24, 16, 8;
91, 81, 72, 63, 54, 45, 36, 27, 18, 9;
111, 100, 90, 80, 70, 60, 50, 40, 30, 20, 10;
133, 121, 110, 99, 88, 77, 66, 55, 44, 33, 22, 11;
157, 144, 132, 120, 108, 96, 84, 72, 60, 48, 36, 24, 12;
...
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CROSSREFS
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Cf. A145677, A002061, A158842
Sequence in context: A086272 A104709 A110814 this_sequence A021319 A010603 A100584
Adjacent sequences: A158838 A158839 A158840 this_sequence A158842 A158843 A158844
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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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