Number of set partitions of {1, ..., n} that avoid enhanced 7-crossings (or enhanced 7-nestings).

A192867

Number of set partitions of {1, ..., n} that avoid enhanced 7-crossings (or enhanced 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) =27644436a(14) =190899266a(15) =1382956734a(16) =10480097431a(17) =82863928963a(18) =682058946982

External references