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1, 4, 2, 7, 5, 3, 10, 8, 6, 4, 13, 11, 9, 7, 5, 16, 14, 12, 10, 8, 6, 19, 17, 15, 13, 11, 9, 7, 22, 20, 18, 16, 14, 12, 10, 8, 25, 23, 21, 19, 17, 15, 13, 11, 9, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Row sums = the hexagonal numbers, A000384: (1, 6, 15, 28, 45,...).
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FORMULA
| 3*A002024 - 2*A051340 as infinite lower triangular matrices.
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EXAMPLE
| First few rows of the triangle are:
1;
4, 2;
7, 5, 3;
10, 8, 6, 4;
13, 11, 9, 7, 5;
16, 14, 12, 10, 8, 6;
19, 17, 15, 13, 11, 9, 7;
...
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CROSSREFS
| Cf. A002024, A051340, A000384.
Sequence in context: A130849 A138754 A021963 * A115302 A109857 A194075
Adjacent sequences: A131911 A131912 A131913 * A131915 A131916 A131917
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 27 2007
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