Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= two.
A287252
Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= two.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =44a(6) =152a(7) =571a(8) =2317a(9) =10096a(10) =47013a(11) =232944a(12) =1223428a(13) =6786936a(14) =39640947a(15) =243060305a(16) =1560340480a(17) =10461611439a(18) =73094563140a(19) =531127372268
External references
- oeis: A287252