OFFSET
1,2
COMMENTS
Row sums = A024916: (1, 4, 8, 15, 21, 33, ...).
FORMULA
By columns, k=1,2,3,...; k repeated terms of the triangular series, (1, 3, 6, 10, ...) in the k-th column.
EXAMPLE
First few rows of the triangle:
1;
3, 1;
6, 1, 1;
10, 3, 1, 1;
15, 3, 1, 1, 1;
21, 6, 3, 1, 1, 1;
28, 6, 3, 1, 1, 1, 1;
36, 10, 3, 3, 1, 1, 1, 1;
45, 10, 6, 3, 1, 1, 1, 1, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Mar 04 2007
EXTENSIONS
a(11) = 1 inserted and more terms from Georg Fischer, May 29 2023
STATUS
approved