Triangle: Number of quasigroups of order n with k idempotents.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =3a(8) =0a(9) =1a(10) =9a(11) =18a(12) =6a(13) =1a(14) =1a(15) =420a(16) =638a(17) =264a(18) =77a(19) =8a(20) =4a(21) =367590a(22) =469675a(23) =227168a(24) =57788a(25) =7712a(26) =580a(27) =18