237228

Appears in sequences

• Number of unitary polyominoes without holes with n cells. A unitary polyomino is a polyomino whose edges all have length 1.at n=39A245660
• G.f. A(x) satisfies: 2*A(x) = 1 + A(x)^3/(1 + x*A(x)^3).at n=11A250918