Number of set partitions of {1, ..., n} that avoid enhanced 6-crossings (or enhanced 6-nestings).

A192866

Number of set partitions of {1, ..., n} that avoid enhanced 6-crossings (or enhanced 6-nestings).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =203a(7) =877a(8) =4140a(9) =21147a(10) =115975a(11) =678569a(12) =4213555a(13) =27643388a(14) =190878823a(15) =1382610179a(16) =10474709625a(17) =82784673008a(18) =680933897225

External references