76315468673domain: NAppears in sequences4th binomial transform of (1,0,1,0,1,...), A059841.at n=16A081186a(n) = (3^(2*n) + 5^(2*n)) / 2.at n=8A081421For n>1, a(n) = 2*a(n-1) + 15*a(n-2); a(0)=1, a(1)=1.at n=16A120612