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A130277
Triangle read by rows: A130209 * A051731 as infinite lower triangular matrices.
0
1, 2, 2, 2, 0, 2, 3, 3, 0, 3, 2, 0, 0, 0, 2, 4, 4, 4, 0, 0, 4, 2, 0, 0, 0, 0, 0, 2, 4, 4, 0, 4, 0, 0, 0, 4, 3, 0, 3, 0, 0, 0, 0, 0, 3, 4, 4, 0, 0, 4, 0, 0, 0, 0, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 6, 6, 6, 0, 6, 0, 0, 0, 0, 0, 6, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 4
OFFSET
1,2
COMMENTS
Row sums = A035116: (1, 4, 4, 9, 4, 16, 4, 16, ...).
Right and left borders = A000005, d(n): (1, 2, 2, 3, 2, 4, 2, ...).
EXAMPLE
First few rows of the triangle:
1;
2, 2;
2, 0, 2;
3, 3, 0, 3;
2, 0, 0, 0, 2;
4, 4, 4, 0, 0, 4;
2, 0, 0, 0, 0, 0, 2;
4, 4, 0, 4, 0, 0, 0, 4;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 18 2007
EXTENSIONS
a(56) corrected and more terms from Georg Fischer, Jun 05 2023
STATUS
approved