Number of twice-crossing partitions on n nodes.
A287221
Number of twice-crossing partitions on n nodes.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =8a(5) =42a(6) =168a(7) =760a(8) =2418a(9) =10490a(10) =30842a(11) =131676
External references
- oeis: A287221