46006694735domain: NAppears in sequencesCoefficients of x in the reduction of the polynomial p(n,x) = ((x+2)^n + (x-2)^n)/2 by x^2->x+2.at n=19A192356Cogrowth sequence of the 12-element group C6 X C2 = <S,T | S^6, T^2, [S,T]>.at n=19A377627