278426domain: NAppears in sequencesThird differences of Catalan numbers A000108.at n=10A033434Number of polyominoes with n cells that tile the plane isohedrally.at n=14A075205a(n) = n^4/6 - 2*n^3/3 - n^2/6 + 5*n/3 + 1.at n=36A299198