OFFSET
1,7
COMMENTS
Row sums = A062570, phi(2*n): (1, 2, 2, 4, 4, 4, 6, 8, ...).
EXAMPLE
First few rows of the triangle:
1;
1, 1;
1, 0, 1;
2, 1, 0, 1;
3, 0, 0, 0, 1;
1, 1, 1, 0, 0, 1;
5, 0, 0, 0, 0, 0, 1;
4, 2, 0, 1, 0, 0, 0, 1;
4, 0, 1, 0, 0, 0, 0, 0, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Apr 20 2007
STATUS
approved