n times n+7 gives the concatenation of two numbers m and m+8.

Terms

a(0) =300a(1) =421a(2) =573a(3) =694a(4) =729a(5) =9856a(6) =36356a(7) =63638a(8) =970299a(9) =4545456a(10) =5454538a(11) =88235296a(12) =351069984a(13) =403018036a(14) =493927127a(15) =506072867a(16) =596981958a(17) =648930010a(18) =736842098a(19) =739839101a(20) =766233768a(21) =769230762a(22) =827751189a(23) =857142859