OFFSET
1,3
COMMENTS
Row sums = the triangular numbers: (1, 3, 6, 10, 15, ...).
Right diagonal = A007438.
FORMULA
EXAMPLE
First few rows of the triangle:
1;
1, 2;
1, 0, 5;
1, 2, 0, 7;
1, 0, 0, 0, 14;
1, 2, 5, 0, 0, 13;
1, 0, 0, 0, 0, 0, 27;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Sep 21 2007
STATUS
approved