136972domain: NAppears in sequencesa(n) = A110722(n)/121.at n=26A110723Expansion of (1-4x+4*x^2)/((1-5x+5*x^2)*(1-3x+x^2)).at n=9A217779Maximum number of ways in which a set of integer-sided rectangular pieces can tile an n X 2 rectangle.at n=10A361218