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EXAMPLE
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a(3) = 7: 001, 010, 011, 100, 101, 110, 111.
a(4) = 12: 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110.
a(5) = 21: 00101, 00110, 00111, 01001, 01010, 01011, 01100, 01101, 01110, 10001, 10010, 10011, 10100, 10101, 10110, 10111, 11001, 11010, 11011, 11100, 11101.
a(6) = 35: 001010, 001011, 001100, 001101, 001110, 010010, 010011, 010100, 010101, 010110, 010111, 011001, 011010, 011011, 011100, 011101, 011110, 100011, 100101, 100110, 100111, 101001, 101010, 101011, 101100, 101101, 101110, 110001, 110010, 110011, 110100, 110101, 110110, 111001, 111010.
a(7) = 62: 0010101, 0010110, 0010111, ..., 1110010, 1110011, 1110100, 1110101.
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