848992domain: NAppears in sequencesNumber of n X 4 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1's.at n=8A295209Expansion of g.f. A(x) satisfying A(x) = 1 + x*(A(x)^2 - A(-x)^2)/2 + x*(A(x)^4 + A(-x)^4)/2.at n=10A368628