77245domain: NAppears in sequencesNumber of binary [ n,4 ] codes.at n=17A034358Number of n X n symmetric 0..3 arrays with no element equal to the sum mod 4 of any two of its horizontal and vertical neighbors.at n=4A193221E.g.f. A(x) satisfies A(x) = x * exp(A(x)) * (1 + 3*A(x)).at n=5A376124