Triangle read by rows: T(n,k) is the number of unoriented series-parallel networks with n colored elements using exactly k colors.

A339282

Triangle read by rows: T(n,k) is the number of unoriented series-parallel networks with n colored elements using exactly k colors.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =14a(5) =10a(6) =11a(7) =84a(8) =168a(9) =98a(10) =30a(11) =522a(12) =2109a(13) =3004a(14) =1396a(15) =98a(16) =3426a(17) =24397a(18) =63094a(19) =67660a(20) =25652a(21) =328a(22) =23404a(23) =274626a(24) =1142420a(25) =2119985a(26) =1805082a(27) =576010a(28) =1193a(29) =165417

External references