Number of set partitions of [n] such that the maximal absolute difference between consecutive elements within a block equals three.

A294052

Number of set partitions of [n] such that the maximal absolute difference between consecutive elements within a block equals three.

Terms

    a(0) =2a(1) =13a(2) =61a(3) =248a(4) =935a(5) =3368a(6) =11777a(7) =40347a(8) =136214a(9) =454922a(10) =1507000a(11) =4961100a(12) =16253188a(13) =53045703a(14) =172607505a(15) =560317916a(16) =1815445901a(17) =5873136282a(18) =18976870985a(19) =61256217631a(20) =197573796328a(21) =636837047532

External references