a(n) = (14^(2*n+1) + 3^(2*n+1)) / 17.A138200a(n) = (14^(2*n+1) + 3^(2*n+1)) / 17.Terms a(0) =1a(1) =163a(2) =31651a(3) =6200923a(4) =1215356851a(5) =238209726283External referencesoeis: A138200