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A128306
Triangle read by rows: A054521 * A007318 as infinite lower triangular matrices.
0
1, 1, 0, 2, 1, 0, 2, 2, 1, 0, 4, 6, 4, 1, 0, 2, 4, 6, 4, 1, 0, 6, 15, 20, 15, 6, 1, 0, 4, 12, 22, 24, 16, 6, 1, 0, 6, 21, 45, 60, 51, 27, 8, 1, 0, 4, 16, 44, 76, 85, 62, 29, 8, 1, 0, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1, 0, 4, 20, 66, 144, 226, 258, 211, 120, 45, 10, 1, 0
OFFSET
1,4
COMMENTS
Left border = phi(n), A000010: (1, 1, 2, 2, 4, 2, 6, ...). Row sums = A054432: (1, 1, 3, 5, 15, 17, 63, ...).
EXAMPLE
First few rows of the triangle:
1;
1, 0;
2, 1, 0;
2, 2, 1, 0;
4, 6, 4, 1, 0;
2, 4, 6, 4, 1, 0;
6, 15, 20, 15, 6, 1, 0;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Feb 25 2007
EXTENSIONS
Definition amended and terms starting at a(56) corrected by Georg Fischer, May 29 2023
STATUS
approved