72663domain: NAppears in sequencesa(0)=-2, a(1)=3; thereafter a(n) = 2*a(n-1) + a(n-2).at n=13A221172a(n) is the smallest denominator D of the fraction N/D with 1 <= D < 2^n which is closest to (3/2)^n.at n=21A324204