a(n) = 2*(10^(2n+1)-1)/9 + 10^n.A332123a(n) = 2*(10^(2n+1)-1)/9 + 10^n.Terms a(0) =3a(1) =232a(2) =22322a(3) =2223222a(4) =222232222a(5) =22222322222External referencesoeis: A332123