OFFSET
1,2
COMMENTS
Row sums of n-th row = A065608(n+1).
FORMULA
Triangle, left border = (1, 2, 3, ...). Each successive column is shifted down twice from previous column and interleaved with k zeros.
EXAMPLE
First few rows of the triangle:
1;
2, 0;
3, 1, 0;
4, 0, 0, 0;
5, 2, 1, 0, 0;
6, 0, 0, 0, 0, 0;
7, 3, 0, 1, 0, 0, 0;
8, 0, 2, 0, 0, 0, 0, 0;
9, 4, 0, 0, 1, 0, 0, 0, 0;
10, 0, 0, 0, 0, 0, 0, 0, 0, 0;
11, 5, 3, 2, 0, 1, 0, 0, 0, 0, 0;
12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
13, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0;
14, 0, 4, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0;
15, 7, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0;
16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
17, 8, 5, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0;
18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
19, 9, 0, 4, 3, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson & Mats Granvik, Apr 29 2010
STATUS
approved