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A301785
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Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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1, 5, 12, 32, 82, 205, 508, 1258, 3129, 7837, 19782, 50310, 128803, 331592, 857434, 2224726, 5787130, 15082283, 39360630, 102820286, 268777679, 702935723, 1839002254, 4812250428, 12594535285, 32965703404, 86292668280, 225894991484
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