Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= six.
A287256
Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= six.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =203a(7) =877a(8) =4139a(9) =21079a(10) =114784a(11) =664100a(12) =4062241a(13) =26164323a(14) =176828713a(15) =1250185783a(16) =9221588229a(17) =70796614497a(18) =564525137134
External references
- oeis: A287256