Triangle read by rows: T(n,k) is the number of oriented series-parallel networks with n colored elements and without multiple unit elements in parallel using exactly k colors.
A339297
Triangle read by rows: T(n,k) is the number of oriented series-parallel networks with n colored elements and without multiple unit elements in parallel using exactly k colors.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =12a(5) =12a(6) =5a(7) =64a(8) =162a(9) =108a(10) =13a(11) =354a(12) =1734a(13) =2760a(14) =1380a(15) =36a(16) =1992a(17) =16977a(18) =48716a(19) =56100a(20) =22440a(21) =103a(22) =11538a(23) =161691a(24) =746316a(25) =1488240a(26) =1338120a(27) =446040a(28) =306a(29) =68427
External references
- oeis: A339297