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EXAMPLE
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For n=2, the two Hamiltonian paths of the square that start at (0,0), i.e.,
(0,0) -->-- (1,0) (0,0) (1,0)
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V and V ^
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(0,1) --<-- (1,1) (0,1) -->-- (1,1),
only account for one, as one is obtained from the other by the x <-> y permutation; so a(2) = 1.
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