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Search: id:A131422
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| 1, 3, 5, 6, 8, 11, 10, 12, 15, 19, 15, 17, 20, 24, 29, 21, 23, 26, 30, 35, 41, 28, 30, 33, 37, 42, 48, 55, 36, 38, 41, 45, 50, 56, 63, 71, 45, 47, 50, 54, 59, 65, 72, 80, 89, 55, 57, 60, 64, 69, 75, 82, 90, 99, 109
(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 border = the triangular series, A000217. Right border = A028387, (1, 5, 11, 19, 29, 41, 55, 71,...). Row sums = A131423: (1, 8, 25, 56, 105, 176, 273,...).
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FORMULA
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(A000012 * A127773) + (A127773 * A000012) - A000012 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 5;
6, 8, 11;
10, 12, 15, 19;
15, 17, 20, 24, 29;
21, 23, 26, 30, 35, 41;
28, 30, 33, 37, 42, 48, 55;
...
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CROSSREFS
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Cf. A127773, A000217, A028387, A131423.
Sequence in context: A120243 A084810 A014254 this_sequence A087720 A047444 A121501
Adjacent sequences: A131419 A131420 A131421 this_sequence A131423 A131424 A131425
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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 10 2007
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