Number of permutation symbols of type .a(n) for hyperbolic archimedean tessellations of rank 2n.
A142868
Number of permutation symbols of type .a(n) for hyperbolic archimedean tessellations of rank 2n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =17a(5) =74a(6) =343a(7) =1603a(8) =7807
External references
- oeis: A142868