Number of set partitions of [n] such that for each block all absolute differences between consecutive elements are <= three.

A287275

Number of set partitions of [n] such that for each block all absolute differences between consecutive elements are <= three.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =47a(6) =150a(7) =481a(8) =1545a(9) =4965a(10) =15958a(11) =51293a(12) =164871a(13) =529947a(14) =1703418a(15) =5475329a(16) =17599457a(17) =56570281a(18) =181834970a(19) =584475733a(20) =1878691887a(21) =6038716423a(22) =19410365422a(23) =62391120801a(24) =200545011401a(25) =644615789581

External references