a(n) is the number of closed binary operations on n elements, labeled, that satisfy both x(yz) = (xy)z and x(yz) = xz identically.
A389829
a(n) is the number of closed binary operations on n elements, labeled, that satisfy both x(yz) = (xy)z and x(yz) = xz identically.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =17a(4) =84a(5) =507a(6) =3668a(7) =31117a(8) =312938a(9) =3669671a(10) =48071832a(11) =690121137a(12) =10912283462a(13) =189568637611
External references
- oeis: A389829