Number of set partitions of {1, ..., n} that avoid 5-nestings.

A192126

Number of set partitions of {1, ..., n} that avoid 5-nestings.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =203a(7) =877a(8) =4140a(9) =21147a(10) =115974a(11) =678530a(12) =4212654a(13) =27627153a(14) =190624976a(15) =1378972826a(16) =10425400681a(17) =82139435907a(18) =672674215928

External references