a(n) = 5*(10^(2*n+1)-1)/9 + 10^n.A332156a(n) = 5*(10^(2*n+1)-1)/9 + 10^n.Terms a(0) =6a(1) =565a(2) =55655a(3) =5556555a(4) =555565555a(5) =55555655555External referencesoeis: A332156