n times n+1 gives the concatenation of two numbers m and m+2.

Terms

a(0) =768a(1) =859a(2) =911a(3) =3286a(4) =6714a(5) =45453a(6) =54547a(7) =990101a(8) =8181820a(9) =70588234a(10) =343130555a(11) =362637364a(12) =363636362a(13) =420053632a(14) =421052633a(15) =497975710a(16) =502024290a(17) =578947367a(18) =579946368a(19) =636363638a(20) =637362636a(21) =656869445a(22) =706766919