Number of set partitions of {1, ..., n} that avoid 7-nestings.

A192128

Number of set partitions of {1, ..., n} that avoid 7-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) =678570a(12) =4213597a(13) =27644437a(14) =190899321a(15) =1382958475a(16) =10480139391a(17) =82864788832a(18) =682074818390

External references