a(n) = (2*n - 1)*(24*n^2 - 42*n + 19).

Terms

a(0) =1a(1) =93a(2) =545a(3) =1645a(4) =3681a(5) =6941a(6) =11713a(7) =18285a(8) =26945a(9) =37981a(10) =51681a(11) =68333a(12) =88225a(13) =111645a(14) =138881a(15) =170221a(16) =205953a(17) =246365a(18) =291745a(19) =342381a(20) =398561a(21) =460573a(22) =528705a(23) =603245a(24) =684481a(25) =772701a(26) =868193a(27) =971245a(28) =1082145a(29) =1201181