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A056638
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Number of polygons of length 2n with two (self-avoiding polygon) holes on square lattice (not allowing rotations).
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2
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2, 122, 3400, 64210, 959742, 12294090, 141329502, 1500596864, 14998956452, 143004562082, 1312929589140, 11688960621918, 101451353794222, 861927965928610, 7191518458613614, 59078731187602024
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