Triangle read by rows: T(n,k) is the number of simple series-parallel matroids on [n] with rank k, 1 <= k <= n.
A361355
Triangle read by rows: T(n,k) is the number of simple series-parallel matroids on [n] with rank k, 1 <= k <= n.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =0a(8) =1a(9) =0a(10) =0a(11) =0a(12) =15a(13) =1a(14) =0a(15) =0a(16) =0a(17) =0a(18) =75a(19) =1a(20) =0a(21) =0a(22) =0a(23) =0a(24) =735a(25) =280a(26) =1a(27) =0a(28) =0a(29) =0
External references
- oeis: A361355