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EXAMPLE
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Lexicographically earliest maximal sets:
a(1) = 3 {0, 1, 2}
a(2) = 3 {00, 01, 02}
a(3) = 4 {000, 001, 112, 122}
a(4) = 9 {0000, 0111, 0222, 1012, 1120, 1201, 2021, 2102, 2210}
a(5) = 9 {00000, 00111, 00222, 01012, 01120, 01201, 02021, 02102, 02210}
a(6) = 11 {000000, 000111, 000222, 001012, 010120, 111201, 212012, 221120, 222021, 222102, 222210}
a(7) = 13 {0000000, 0000111, 0000222, 0001012, 0001120, 0001201, 0002021, 0112102, 0222210, 1012210, 1202102, 2022102, 2102210}
a(8) = 17 {00000000, 00000111, 00000222, 00001012, 00010120, 01102012, 02220120, 10120120, 11211201, 12002012, 20202012, 21020120, 22112012, 22121120, 22122021, 22122102, 22122210}
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