Number of essentially series unoriented series-parallel networks with n elements.
A339223
Number of essentially series unoriented series-parallel networks with n elements.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =57a(6) =196a(7) =723a(8) =2729a(9) =10638a(10) =42161a(11) =169912a(12) =692703a(13) =2853523a(14) =11852644a(15) =49592966a(16) =208800209a(17) =883970867a(18) =3760605627a(19) =16068272965a(20) =68925340187a(21) =296705390322
External references
- oeis: A339223