A098176 Smallest available number such that the last digit of n and the first digit of n+1 sum to 2.

1, 10, 20, 21, 11, 100, 200, 201, 101, 110, 210, 211, 111, 120, 220, 221, 121, 130, 230, 231, 131, 140, 240, 241, 141, 150, 250, 251, 151, 160, 260, 261, 161, 170, 270, 271, 171, 180, 280, 281, 181, 190, 290, 291, 191, 1000, 2010, 2011, 1001, 1010, 2020