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

A339228

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

Terms

    a(0) =1a(1) =2a(2) =3a(3) =5a(4) =22a(5) =19a(6) =15a(7) =146a(8) =321a(9) =195a(10) =48a(11) =970a(12) =4116a(13) =5972a(14) =2791a(15) =167a(16) =6601a(17) =48245a(18) =125778a(19) =135235a(20) =51303a(21) =602a(22) =46012a(23) =546570a(24) =2281528a(25) =4238415a(26) =3609966a(27) =1152019a(28) =2256a(29) =328188

External references