Triangle T(n,m) read by rows: the number of series-parallel networks with n+2 vertices and m+n+1 edges.

A181320

Triangle T(n,m) read by rows: the number of series-parallel networks with n+2 vertices and m+n+1 edges.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =7a(5) =5a(6) =6a(7) =48a(8) =91a(9) =49a(10) =24a(11) =360a(12) =1304a(13) =1697a(14) =729a(15) =120a(16) =3000a(17) =17910a(18) =41440a(19) =41051a(20) =14641a(21) =720a(22) =27720a(23) =249900a(24) =899730a(25) =1524282a(26) =1218745a(27) =371293

External references