Number of set partitions of [n] such that the maximal absolute difference between the least elements of consecutive blocks equals two.
A322875
Number of set partitions of [n] such that the maximal absolute difference between the least elements of consecutive blocks equals two.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =21a(4) =86a(5) =361a(6) =1584a(7) =7315a(8) =35635a(9) =183080a(10) =990659a(11) =5635021a(12) =33622161a(13) =209973099a(14) =1369560267a(15) =9310957518a(16) =65852852210a(17) =483672626464
External references
- oeis: A322875