OFFSET
1,2
FORMULA
From David Wasserman, May 13 2004: (Start)
a(n) = (ceiling(sqrt(n(n+1)/2)))^2 - n(n-1)/2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Mar 21 2003
EXTENSIONS
More terms from David Wasserman, May 13 2004
STATUS
approved