OFFSET
1,2
COMMENTS
FORMULA
T(n,k) = 1 if n*(n-1)/2+k is a square, otherwise T(n,k) = 3.
EXAMPLE
First few rows of the triangle =
.
1;
3, 3;
1, 3, 3;
3, 3, 1, 3;
3, 3, 3, 3, 3;
1, 3, 3, 3, 3, 3;
3, 3, 3, 1, 3, 3, 3;
3, 3, 3, 3, 3, 3, 3, 1;
...
CROSSREFS
KEYWORD
AUTHOR
Gary W. Adamson, Dec 06 2009
EXTENSIONS
Description corrected by Robert Israel, Jan 03 2019
STATUS
approved