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A057410
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Number of staircase polygons of perimeter 2n with one (staircase polygon) hole on square lattice (not allowing rotations).
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4
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1, 12, 94, 604, 3463, 18440, 93274, 454412, 2151673, 9964500, 45335002, 203303760, 900901387, 3952468348, 17194102478, 74257185512, 318693463933, 1360298775524, 5778468266446, 24442845038580
(list; graph; refs; listen; history; internal format)
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