a(n) = (3*n)^6.

Terms

a(0) =0a(1) =729a(2) =46656a(3) =531441a(4) =2985984a(5) =11390625a(6) =34012224a(7) =85766121a(8) =191102976a(9) =387420489a(10) =729000000a(11) =1291467969a(12) =2176782336a(13) =3518743761a(14) =5489031744a(15) =8303765625a(16) =12230590464a(17) =17596287801a(18) =24794911296