1743392199domain: NAppears in sequencesa(n) = (3^n - 3)/2.at n=19A029858a(0) = 1, a(1) = 3, a(n) = 3*a(n-1) + 3 for n > 1.at n=19A123109a(n) = 3*A132357(n).at n=18A135264a(n) is the numerator of the ratio of winning probabilities in a game similar to A370823, but with a draw and single round odds A:B:draw of 3:2:1.at n=18A370825