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A134447
0
1, 1, 2, 4, 2, 3, 4, 6, 3, 4, 9, 6, 8, 4, 5, 9, 12, 8, 10, 5, 6, 16, 12, 15, 10, 12, 6, 7, 16, 20, 15, 18, 12, 14, 7, 8, 25, 20, 24, 18, 21, 14, 16, 8, 9, 25, 30, 24, 28, 21, 24, 16, 18, 9, 10
OFFSET
1,3
COMMENTS
Row sums = A049778: (1, 3, 9, 17, 32, 50, 78, ...).
FORMULA
A002260 * A128174 as infinite lower triangular matrices.
EXAMPLE
First few rows of the triangle:
1;
1, 2;
4, 2, 3;
4, 6, 3, 4;
9, 6, 8, 4, 5;
9, 12, 8, 10, 5, 6;
16, 12, 15, 10, 12, 6, 7;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Oct 25 2007
STATUS
approved