136341domain: NAppears in sequencesa(n) = (4^n mod 3^n) mod 2^n.at n=19A064536G.f. A(x) satisfies: 1 = Sum_{n>=0} ( (1+x)^n - 19*x*A(x) )^n * 9^n / 10^(n+1).at n=2A323320Record high values in A245340.at n=13A370956