a(n) = n*(4*n^4 + 1).

Terms

a(0) =0a(1) =5a(2) =130a(3) =975a(4) =4100a(5) =12505a(6) =31110a(7) =67235a(8) =131080a(9) =236205a(10) =400010a(11) =644215a(12) =995340a(13) =1485185a(14) =2151310a(15) =3037515a(16) =4194320a(17) =5679445a(18) =7558290a(19) =9904415a(20) =12800020a(21) =16336425a(22) =20614550a(23) =25745395a(24) =31850520a(25) =39062525a(26) =47525530a(27) =57395655a(28) =68841500a(29) =82044625