Figure 8's with 2n edges on the square lattice.

A003305

Figure 8's with 2n edges on the square lattice.

Terms

    a(0) =2a(1) =8a(2) =40a(3) =208a(4) =1120a(5) =6200a(6) =35236a(7) =204664a(8) =1210392a(9) =7266824a(10) =44184288

External references