Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks and between consecutive elements within the blocks are not larger than seven.
A287586
Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks and between consecutive elements within the blocks are not larger than seven.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =203a(7) =877a(8) =4140a(9) =20269a(10) =101873a(11) =520839a(12) =2690517a(13) =13976694a(14) =72797864a(15) =379609217a(16) =1981204605a(17) =10341627330a(18) =53967714273a(19) =281504203138
External references
- oeis: A287586