932352domain: NAppears in sequencesLet M be the 3 X 3 Matrix [ -4 4 8 / 1 0 0 / 0 1 0], a(n) = absolute value of the center term of M^n * [1 1 1].at n=9A094253Number of binary strings of length n with equal numbers of 00100 and 00110 substrings.at n=21A164235