OFFSET
0,2
COMMENTS
Row sums = A081307: (1, 3, 4, 8, 6, 16, 8, 21, 17, ...).
FORMULA
Arithmetic sequences by columns, (1,2,3,...); (1,3,5,...); (1,4,7,...); interspersed with k zeros, k=0,1,2,...
EXAMPLE
First few rows of the triangle:
1;
2, 1;
3, 0, 1;
4, 3, 0, 1;
5, 0, 0, 0, 1;
6, 5, 4, 0, 0, 1;
7, 0, 0, 0, 0, 0, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 02 2007
STATUS
approved