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A303676
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Number of n X n 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero.
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0
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1, 5, 9, 28, 76, 177, 367, 774, 1684, 3639, 7597, 15617, 32101, 66074, 135096, 274104, 553668, 1116275, 2245277, 4501938, 9000074, 17953486, 35749382, 71056212, 140977366, 279246077, 552333115, 1091040731
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