OFFSET
1,5
COMMENTS
Row sums = phi(n), A000010: (1, 1, 2, 2, 4, 2, 6, 4, 6, 4, ...).
EXAMPLE
First few rows of the triangle:
1;
1, 0;
0, 2, 0;
1, -2, 3, 0;
0, 0, 0, 4, 0;
1, 0, 0, -4, 5, 0;
...
CROSSREFS
KEYWORD
tabl,sign
AUTHOR
Gary W. Adamson, Mar 11 2007
EXTENSIONS
a(28) = 0 inserted and more terms from Georg Fischer, May 29 2023
STATUS
approved