827651domain: NAppears in sequencesNumber of n X 2 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1s.at n=11A295525Expansion of g.f. A(x) satisfying x = A(x) * (1 - A(x)) / (1 - A(x) - A(x)^5) such that A(0) = 1.at n=8A367725