a(n) = ceiling((n+1/n)^7).

Terms

a(0) =128a(1) =611a(2) =4573a(3) =25046a(4) =102808a(5) =339120a(6) =948646a(7) =2337565a(8) =5211940a(9) =10721354a(10) =20642868a(11) =37610343a(12) =65394163a(13) =109236389a(14) =176246403a(15) =275862067a(16) =420381443a(17) =625570112a(18) =911349138a(19) =1302568702a(20) =1829872466a(21) =2530657692a(22) =3450136162a(23) =4642500938a(24) =6172204002a(25) =8115349816