a(n) = 6*(n - 1)*(81*n - 104) for n >= 1.

Terms

a(0) =0a(1) =348a(2) =1668a(3) =3960a(4) =7224a(5) =11460a(6) =16668a(7) =22848a(8) =30000a(9) =38124a(10) =47220a(11) =57288a(12) =68328a(13) =80340a(14) =93324a(15) =107280a(16) =122208a(17) =138108a(18) =154980a(19) =172824a(20) =191640a(21) =211428a(22) =232188a(23) =253920a(24) =276624a(25) =300300a(26) =324948a(27) =350568a(28) =377160a(29) =404724