Number of nonisomorphic disconnected partial lattices.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =6a(5) =18a(6) =69a(7) =287a(8) =1397a(9) =7634a(10) =46972a(11) =321014a(12) =2416305a(13) =19840547a(14) =176267022a(15) =1681915809a(16) =17127587977a(17) =185127766583