A044422 Numbers n such that string 9,0 occurs in the base 10 representation of n but not of n-1.

90, 190, 290, 390, 490, 590, 690, 790, 890, 900, 990, 1090, 1190, 1290, 1390, 1490, 1590, 1690, 1790, 1890, 1900, 1990, 2090, 2190, 2290, 2390, 2490, 2590, 2690, 2790, 2890, 2900, 2990, 3090, 3190, 3290, 3390, 3490, 3590