70484domain: NAppears in sequencesG.f. A(x) satisfies: 4*A(x) = A(A(A(x))) + 3*x + x^2 with A(0)=0.at n=5A138913Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0111-1100-0111 pattern in any orientation.at n=19A147372a(n) = (9*n+2)*(9*n+7).at n=29A177072