A030351 Write n in base 3, then complement each digit (d -> 2-d) and juxtapose.

1, 0, 1, 2, 1, 1, 1, 0, 0, 2, 0, 1, 0, 0, 1, 2, 2, 1, 2, 1, 1, 2, 0, 1, 1, 2, 1, 1, 1, 1, 1, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 2, 2, 0, 2, 1, 0, 2, 0, 0, 1, 2, 0, 1, 1, 0, 1, 0, 0, 0, 2, 0, 0, 1, 0, 0, 0, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 0, 1, 2, 1, 2, 1, 2, 1, 1, 1, 2