a(n) is the number of c-nets with n+1 vertices and 2n edges, n >= 1.
A001506
a(n) is the number of c-nets with n+1 vertices and 2n edges, n >= 1.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =4a(4) =24a(5) =188a(6) =1705a(7) =16980a(8) =180670a(9) =2020120a(10) =23478426a(11) =281481880a(12) =3461873536a(13) =43494961404a(14) =556461656569
External references
- oeis: A001506