OFFSET
0,3
COMMENTS
Also the skewed triangle read by nonzero columns:
1, 2
0, 3, 4, 5
0, 0, 6, 7, 8, 9
0, 0, 0, 10,11,12,13,14
... (offset 0,0), - Ralf Stephan, Mar 09 2014
FORMULA
a(n) = A091995(n+1)-1.
As skewed triangle: T(n,k) = (n+1)*(n+2)/2 + k-n, for n <= k <= 2n+2. - Ralf Stephan, Mar 09 2014
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Feb 25 2004
STATUS
approved