Triangle read by rows: T(n,k) is the number of simple quasi series-parallel matroids on [n] with rank k, 1 <= k <= n.
A361353
Triangle read by rows: T(n,k) is the number of simple quasi series-parallel matroids on [n] with rank k, 1 <= k <= n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =0a(8) =5a(9) =1a(10) =0a(11) =0a(12) =15a(13) =16a(14) =1a(15) =0a(16) =0a(17) =0a(18) =175a(19) =42a(20) =1a(21) =0a(22) =0a(23) =0a(24) =735a(25) =1225a(26) =99a(27) =1a(28) =0a(29) =0
External references
- oeis: A361353