a(n) = 8*(10^(2n+1)-1)/9 - 3*10^n.A332185a(n) = 8*(10^(2n+1)-1)/9 - 3*10^n.Terms a(0) =5a(1) =858a(2) =88588a(3) =8885888a(4) =888858888a(5) =88888588888External referencesoeis: A332185