OFFSET
0,3
LINKS
Milan Janjic, Two Enumerative Functions
FORMULA
Conjecture: (n-1)*(2*n-1)*(n+2)*a(n) -12*n*(n-1)*(n+1)*a(n-1) +(n-2)*(2*n+1)*(n+1)*a(n-2)=0. - R. J. Mathar, Oct 26 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved