a(n) = 4*n^3 + 5*n^2 + 2*n + 1.

Terms

a(0) =1a(1) =12a(2) =57a(3) =160a(4) =345a(5) =636a(6) =1057a(7) =1632a(8) =2385a(9) =3340a(10) =4521a(11) =5952a(12) =7657a(13) =9660a(14) =11985a(15) =14656a(16) =17697a(17) =21132a(18) =24985a(19) =29280a(20) =34041a(21) =39292a(22) =45057a(23) =51360a(24) =58225a(25) =65676a(26) =73737a(27) =82432a(28) =91785a(29) =101820