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1, 4, 4, 7, 1, 7, 10, 1, 1, 10, 13, 1, 1, 1, 13, 16, 1, 1, 1, 1, 16, 19, 1, 1, 1, 1, 1, 19, 22, 1, 1, 1, 1, 1, 1, 22, 25, 1, 1, 1, 1, 1, 1, 1, 25, 28, 1, 1, 1, 1, 1, 1, 1, 1, 28
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums = A016993, (7n + 1): (1, 8, 15, 22, 29,...).
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FORMULA
| 3*A131821 - 2*A000012 as infinite lower triangular matrices. Infinite lower triangular matrix, (3n + 1): (1, 4, 7, 10,...) as right and left borders and the rest 1's.
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EXAMPLE
| First few rows of the triangle are:
1;
4, 4;
7, 1, 7;
10, 1, 1, 10;
13, 1, 1, 1, 13;
16, 1, 1, 1, 1, 16;
...
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CROSSREFS
| Cf. A131821, A016993.
Sequence in context: A198138 A196463 A021695 * A010476 A020762 A204158
Adjacent sequences: A131841 A131842 A131843 * A131845 A131846 A131847
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KEYWORD
| nonn
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 22 2007
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