a(n) = n^8 + n.

Terms

a(0) =0a(1) =2a(2) =258a(3) =6564a(4) =65540a(5) =390630a(6) =1679622a(7) =5764808a(8) =16777224a(9) =43046730a(10) =100000010a(11) =214358892a(12) =429981708a(13) =815730734a(14) =1475789070a(15) =2562890640a(16) =4294967312a(17) =6975757458a(18) =11019960594a(19) =16983563060a(20) =25600000020a(21) =37822859382a(22) =54875873558a(23) =78310985304