a(n) = ceiling(((1*n^0 + 1*n^1 + 2*n^2 + 4*n^3)/(1*n^0 + 2*n^1 + 1*n^2))^2).

Terms

a(0) =4a(1) =23a(2) =67a(3) =138a(4) =239a(5) =371a(6) =534a(7) =728a(8) =954a(9) =1212a(10) =1501a(11) =1822a(12) =2175a(13) =2560a(14) =2977a(15) =3425a(16) =3906a(17) =4419a(18) =4963a(19) =5539a(20) =6148a(21) =6788a(22) =7461a(23) =8165a(24) =8901a(25) =9669a(26) =10470a(27) =11302a(28) =12166a(29) =13062