OFFSET
1,2
COMMENTS
Row sums = the hexagonal numbers, A000384: (1, 6, 15, 28, 45, 66, 91, ...).
EXAMPLE
First few rows of the triangle:
1;
4, 2;
5, 7, 3;
6, 8, 10, 4;
7, 9, 11, 13, 5;
8, 10, 12, 14, 16, 6;
9, 11, 13, 15, 17, 19, 7;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Oct 14 2007
STATUS
approved