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

A287276

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =188a(7) =696a(8) =2606a(9) =9800a(10) =36931a(11) =139303a(12) =525658a(13) =1983925a(14) =7488281a(15) =28265353a(16) =106692425a(17) =402731694a(18) =1520195297a(19) =5738304135a(20) =21660476556a(21) =81762200416a(22) =308629323572

External references