OFFSET
0,2
FORMULA
M * A007318, where M = an infinite lower triangular matrix with rows: n-th row = (n-1) zeros followed by T(n), 1; T(n) = n-th triangular number. M = an infinite lower triangular matrix with (1,1,1,...) in the main diagonal and the triangular series in the subdiagonal.
EXAMPLE
First few rows of the triangle:
1;
2, 1;
4, 5, 1;
7, 15, 9, 1;
11, 34, 36, 14, 1;
16, 65, 100, 70, 20, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Oct 15 2007
STATUS
approved