Number of n-colorings of the 3 X 3 X 3 triangular grid.

Terms

a(0) =0a(1) =0a(2) =0a(3) =6a(4) =192a(5) =1620a(6) =7680a(7) =26250a(8) =72576a(9) =172872a(10) =368640a(11) =721710a(12) =1320000a(13) =2283996a(14) =3773952a(15) =5997810a(16) =9219840a(17) =13770000a(18) =20054016a(19) =28564182a(20) =39890880a(21) =54734820a(22) =73920000a(23) =98407386a(24) =129309312a(25) =167904600a(26) =215654400a(27) =274218750a(28) =345473856