Number of set partitions of {1..n} such that the median of medians of the blocks is (n+1)/2.
A361863
Number of set partitions of {1..n} such that the median of medians of the blocks is (n+1)/2.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =9a(4) =26a(5) =69a(6) =335a(7) =1018a(8) =6629a(9) =22805a(10) =182988a(11) =703745
External references
- oeis: A361863