Number of crossing partitions of n.

Terms

a(0) =1a(1) =5a(2) =20a(3) =84a(4) =388a(5) =1951a(6) =10529a(7) =60478a(8) =367953a(9) =2362503a(10) =15955673a(11) =113015123a(12) =837307541a(13) =6473306155a(14) =52110629576a(15) =435951806195