Number of walks of length 2n on the square lattice that start and end at (0,0) and avoid the negative quadrant.
A260155
Number of walks of length 2n on the square lattice that start and end at (0,0) and avoid the negative quadrant.
Terms
- a(0) =1a(1) =4a(2) =32a(3) =318a(4) =3530a(5) =41944a(6) =522010a(7) =6719018a(8) =88726840a(9) =1195527822a(10) =16373466714a(11) =227280520316
External references
- oeis: A260155