Number of bipartite partitions of (i,j) with i+j = n into distinct pairs.

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =19a(5) =38a(6) =73a(7) =134a(8) =242a(9) =430a(10) =749a(11) =1282a(12) =2171a(13) =3622a(14) =5979a(15) =9770a(16) =15802a(17) =25334a(18) =40288a(19) =63560a(20) =99554a(21) =154884a(22) =239397a(23) =367800a(24) =561846a(25) =853584a(26) =1290107a(27) =1940304a(28) =2904447a(29) =4328184