19068105488domain: NAppears in sequencesa(n) = 2*a(n-1)+15*a(n-2) with n>0, a(0)=0, a(1)=1.at n=16A079773a(n) = ((1 + sqrt(n))^n - (1 - sqrt(n))^n)/(2*sqrt(n)).at n=15A357502