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A131897
1
1, 3, 2, 6, 2, 3, 11, 4, 2, 4, 20, 8, 4, 2, 5, 37, 16, 8, 4, 2, 6, 70, 32, 16, 8, 4, 2, 7, 135, 64, 32, 16, 8, 4, 2, 8, 264, 128, 64, 32, 16, 8, 4, 2, 9, 521, 256, 128, 64, 32, 16, 8, 4, 2, 10
OFFSET
0,2
COMMENTS
Left column = A006127: (1, 3, 6, 11, 20, 37, ...).
Row sums = A131898: (1, 5, 11, 21, 39, 73, ...).
FORMULA
A131321 + A131821 - A000012 as infinite lower triangular matrices.
EXAMPLE
First few rows of the triangle:
1;
3, 2;
6, 2, 3;
11, 4, 2, 4;
20, 8, 4, 2, 5;
37, 16, 8, 4, 2, 6;
70, 32, 16, 8, 4, 2, 7;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jul 25 2007
STATUS
approved