Total number of interior vertices in the multigraphs of all unoriented series-parallel networks with n edges.
A339286
Total number of interior vertices in the multigraphs of all unoriented series-parallel networks with n edges.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =17a(4) =62a(5) =255a(6) =1026a(7) =4363a(8) =18656a(9) =81446a(10) =357708a(11) =1584110a(12) =7042396a(13) =31429998a(14) =140626375a(15) =630640342a(16) =2833200433a(17) =12748771157a(18) =57445747751a(19) =259170739397
External references
- oeis: A339286