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A134237
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Triangle read by rows, a(1) = 1, n-th row n terms of: (2n-1, 2n, 2n+1..., followed by n).
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1
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1, 3, 2, 5, 6, 3, 7, 8, 9, 4, 9, 10, 11, 12, 5, 11, 12, 13, 14, 15, 6, 13, 14, 15, 16, 17, 8, 7, 15, 16, 17, 18, 19, 20, 21, 8, 17, 18, 19, 20, 21, 22, 23, 24, 919, 20, 21, 22, 23, 24, 25, 26, 27, 10
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Row sums = A134238: (1, 5, 14, 28, 47, 71, 100, 134,...).
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EXAMPLE
| First few rows of the triangle are:
1;
3, 2;
5, 6, 3;
7, 8, 9, 4;
9, 10, 11, 12, 5;
11, 12, 13, 14, 15, 6;
13, 14, 15, 16, 17, 18, 7;
...
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CROSSREFS
| Cf. A134238.
Sequence in context: A035546 A182714 A198755 * A099889 A115511 A182801
Adjacent sequences: A134234 A134235 A134236 * A134238 A134239 A134240
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 14 2007
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