Association types in 3-dimensional algebra.

Terms

a(0) =1a(1) =3a(2) =18a(3) =132a(4) =1080a(5) =9450a(6) =86544a(7) =819154a(8) =7949532a(9) =78671736a(10) =790930728a(11) =8055355698a(12) =82935309996a(13) =861772240368