Number of set partitions of {1,...,n} that avoid enhanced 5-crossings (or 5-nestings).

A192865

Number of set partitions of {1,...,n} that avoid enhanced 5-crossings (or 5-nestings).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =203a(7) =877a(8) =4140a(9) =21146a(10) =115945a(11) =678012a(12) =4205209a(13) =27531954a(14) =189486817a(15) =1365888674a(16) =10278272450a(17) =80503198320a(18) =654544093035

External references