Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most seven elements and for at least one block c the smallest integer interval containing c has exactly seven elements.
A320557
Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most seven elements and for at least one block c the smallest integer interval containing c has exactly seven elements.
Terms
- a(0) =203a(1) =1197a(2) =4971a(3) =18223a(4) =63768a(5) =220419a(6) =779242a(7) =2845864a(8) =10418560a(9) =37768970a(10) =135153976a(11) =477964329a(12) =1676343822a(13) =5852483376a(14) =20403590238a(15) =71080014610a(16) =247360604490a(17) =859493636214
External references
- oeis: A320557