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A057416
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Number of staircase polygons of area n with 3 (staircase polygon) holes on square lattice (not allowing rotations).
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1
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4, 30, 184, 894, 3885, 15386, 56956, 199620, 669702, 2166462, 6798186, 20786496, 62160079, 182336358, 525931258, 1494726848, 4192885357, 11625457180, 31899800729, 86717361496, 233754981005, 625311996048
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