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EXAMPLE
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0, 1, 10, 11, 100, 101, 110, 111, 1000.....
Delete 2nd, 4th, 6th,.. (even) occurrence of 0 (replaced by ~):
0, 1, 1~, 11, 10~, 101, 11~, 111, 10~0
Delete 2nd, 4th 6th,... (even) occurrence of 1 (replaced by ~):
0, 1, ~~, 1~, 10~, ~01, ~1~, ~1~, 10~0
The numbers left are:
0, 1, 1, 10, 1, 1, 1, 100, and in base 10: 0, 1, 1, 2, 1, 1, 1, 4, ....as shown by a(n).
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