Number of 2n-step self avoiding closed walks on square grid, restricted to a quadrant and passing through origin.

A034010

Number of 2n-step self avoiding closed walks on square grid, restricted to a quadrant and passing through origin.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =6a(4) =20a(5) =74a(6) =300a(7) =1302a(8) =5944a(9) =28266a(10) =139010a(11) =703102a(12) =3641956a(13) =19255106a(14) =103630920a(15) =566522778a(16) =3140130354a(17) =17620845976a(18) =99977635264a(19) =572935630884

External references