Number of species of separated Latin bi-trades of size n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =1a(6) =1a(7) =3a(8) =3a(9) =9a(10) =10a(11) =47a(12) =82a(13) =324a(14) =1053a(15) =4686a(16) =20337a(17) =99833a(18) =505865