OFFSET
0,2
FORMULA
(1/12)(2n+1)(2n^6+6n^5+11n^4+12n^3+25n^2+20n+12). - Ralf Stephan, May 16 2007
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 04 2005
STATUS
approved