a(n) = A162391(n)^2.

Terms

a(0) =1a(1) =144a(2) =441a(3) =36864a(4) =86436a(5) =6431296a(6) =6964321a(7) =15233409a(8) =23658496a(9) =28536964a(10) =38962564a(11) =53319204a(12) =62948356a(13) =64368529a(14) =84529636a(15) =94303521a(16) =148011556a(17) =429276961a(18) =515108416a(19) =674129296a(20) =2687074569a(21) =2751317209a(22) =3719170225a(23) =4786702596a(24) =4877206569a(25) =4897760256a(26) =5874762609