OFFSET
1,4
COMMENTS
Row sums = n, right and left borders = A000012, phi(n).
FORMULA
EXAMPLE
First few rows of the triangle =
1;
1,...1;
2,..-1,...2;
2,...0,...0,...2;
4,..-1,..-1,..-1,...4;
2,...0,...2,..-1,...1,...2;
6,..-1,..-1,..-1,..-1,..-1,...6;
4,...0,...0,...0,...0,...0,...0,...4;
6,..-3,...3,...0,...0,..-3,...0,...0,...6;
4,...2,..-1,..-3,...4,..-1,...1,..-1,...1,...4;
10,.-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,...10;
4,..-4,...4,...2,...2,...0,...0,..-2,...0,...2,....0,...4;
12,.-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,..-1,...-1,..-1,...12;
6,...4,..-1,..-3,..-1,..-3,...6,..-1,...1,..-1,....1,...1,....1,...6;
8,..-7,...5,..-2,...8,..-2,...1,...1,..-2,..-4,....1,..-2,....1,...1,...8;
8,...0,...0,...0,...0,...0,...0,...0,...0,...0,....0,...0,....0,...0,...0,...8;
...
CROSSREFS
KEYWORD
tabl,sign
AUTHOR
Gary W. Adamson, Apr 25 2009
EXTENSIONS
a(29) split and more terms from Georg Fischer, May 29 2023
STATUS
approved