n times n+7 gives the concatenation of two numbers m and m-6.

Terms

a(0) =95a(1) =384a(2) =428a(3) =566a(4) =610a(5) =813a(6) =995a(7) =4520a(8) =5474a(9) =9995a(10) =90909a(11) =99995a(12) =316831a(13) =683163a(14) =999995a(15) =3636363a(16) =6363631a(17) =9999995a(18) =82352941a(19) =99999995a(20) =331668331a(21) =368421052a(22) =395604390a(23) =442767753a(24) =461538461a(25) =488721799a(26) =511278195a(27) =538461533