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1, 4, 3, 7, 6, 3, 10, 9, 8, 7, 13, 12, 11, 10, 9, 16, 15, 14, 13, 12, 11, 19, 18, 17, 16, 15, 14, 13, 22, 21, 10, 19, 18, 17, 16, 15, 25, 24, 23, 22, 21, 20, 19, 18, 17, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums = A000566, the heptagonal numbers: (1, 7, 18, 34, 55,...).
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FORMULA
| A002024 + A128076 - A000012 as infinite lower triangular matrices. By rows, (n+1) terms of 3n+1, 3n, 3n-1,...
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EXAMPLE
| First few rows of the triangle are:
1;
4, 3;
7, 6, 5;
10, 9, 8, 7;
13, 12, 11, 10, 9;
16, 15, 14, 13, 12, 11;
19, 18, 17, 16, 15, 14, 13;
...
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CROSSREFS
| Cf. A128076, A002024, A000566.
Sequence in context: A093051 A089020 A046560 * A205392 A168200 A112887
Adjacent sequences: A131410 A131411 A131412 * A131414 A131415 A131416
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 08 2007
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