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Search: id:A131413
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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; listen)
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OFFSET
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0,2
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COMMENT
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Row sums = A000566, the heptagonal numbers: (1, 7, 18, 34, 55,...).
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FORMULA
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A002024 + A128076 - A000012 as infinite lower triangular matrices. By rows, (n+1) terms of 3n+1, 3n, 3n-1,...
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EXAMPLE
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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
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Cf. A128076, A002024, A000566.
Sequence in context: A093051 A089020 A046560 this_sequence A112887 A010654 A048227
Adjacent sequences: A131410 A131411 A131412 this_sequence A131414 A131415 A131416
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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 08 2007
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