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A137587
Triangle read by rows: A051731 * A026794.
2
1, 2, 1, 3, 0, 1, 5, 2, 0, 1, 6, 1, 0, 0, 1, 11, 3, 2, 0, 0, 1, 12, 2, 1, 0, 0, 0, 1, 20, 6, 1, 2, 0, 0, 0, 1, 25, 4, 3, 1, 0, 0, 0, 0, 1, 37, 9, 2, 1, 2, 0, 0, 0, 0, 1, 43, 8, 3, 1, 1, 0, 0, 0, 0, 0, 1, 70, 16, 6, 3, 1, 2, 0, 0, 0, 0, 0, 1
OFFSET
1,2
COMMENTS
That is, regard A051731 and A026794 as lower triangular square matrices and multiply them, then take the lower triangle of the product,
Left column = A083710 starting (1, 2, 3, 5, 6, 11, 12, ...).
Row sums = A047968.
FORMULA
Inverse mobius transform of the partition triangle, A026794.
EXAMPLE
First few rows of the triangle:
1;
2, 1;
3, 0, 1;
5, 2, 0, 1;
6, 1, 0, 0, 1;
11, 3, 2, 0, 0, 1;
12, 2, 1, 0, 0, 0, 1;
20, 6, 1, 2, 0, 0, 0, 1;
25, 4, 3, 1, 0, 0, 0, 0, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jan 27 2008
EXTENSIONS
Typo in 9th row corrected by M. F. Hasler, Jun 08 2009
STATUS
approved