a(n) = (n^2 - n + 2) * (5*n^2 - 5*n + 2) / 4.

Terms

a(0) =1a(1) =12a(2) =64a(3) =217a(4) =561a(5) =1216a(6) =2332a(7) =4089a(8) =6697a(9) =10396a(10) =15456a(11) =22177a(12) =30889a(13) =41952a(14) =55756a(15) =72721a(16) =93297a(17) =117964a(18) =147232a(19) =181641a(20) =221761a(21) =268192a(22) =321564a(23) =382537a(24) =451801a(25) =530076a(26) =618112a(27) =716689a(28) =826617a(29) =948736