OFFSET
0,3
COMMENTS
See also A090894 (downward diagonal).
FORMULA
a(n) = A056536(n+1) - 1.
EXAMPLE
0; 1; 3,2; 6,4; 10,7,5; 15,11,8; 21,16,12,9; 28,22,17,13; ...
PROG
(PARI) T(n, k)=(n-k)^2+(n+k) /* Michael Somos, May 31 2005 */
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Feb 25 2004
STATUS
approved