a(n) = 8*(10^(2n+1)-1)/9 - 2*10^n.A332186a(n) = 8*(10^(2n+1)-1)/9 - 2*10^n.Terms a(0) =6a(1) =868a(2) =88688a(3) =8886888a(4) =888868888a(5) =88888688888External referencesoeis: A332186