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A057411
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Number of staircase polygons of perimeter 2n with 2 (staircase polygon) holes on square lattice (not allowing rotations).
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1
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2, 54, 737, 7330, 60362, 438284, 2908069, 18032906, 106088843, 598428100, 3261717223, 17278076588, 89351738840, 452686823796, 2253216812878, 11043624323310, 53399946187312, 255135202590382, 1206067676613670
(list; graph; refs; listen; history; internal format)
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