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1, 4, 7, 7, 10, 13, 10, 13, 16, 19, 13, 16, 19, 22, 25, 16, 19, 22, 25, 28, 31, 19, 22, 25, 28, 31, 34, 37, 23, 26, 29, 32, 35, 38, 41, 45, 26, 29, 32, 35, 38, 41, 44, 48, 51, 29, 32, 35, 38, 41, 44, 47, 51, 54, 57
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Left border = A016777, (1, 4, 7, 10, 13,...). Right border = A016921: (1, 7, 13, 19, 25,...). Row sums = A051682, 11-gonal numbers: (1, 11, 30, 58, 95,...).
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FORMULA
| (A000012 * A131431) + (A131431 * A000012) - A000012 as infinite lower triangular matrices.
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EXAMPLE
| First few rows of the triangle are:
1;
4, 7;
7, 10, 13;
10, 13, 16, 19;
13, 16, 19, 22, 25;
16, 19, 22, 25, 28, 31;
19, 22, 25, 28, 31, 34, 37;
...
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CROSSREFS
| Cf. A131431, A016777, A016921, A051682.
Sequence in context: A103711 A199435 A159919 * A088744 A061891 A168074
Adjacent sequences: A131429 A131430 A131431 * A131433 A131434 A131435
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 10 2007
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