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A268802
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Number of n X n 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.
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1
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3, 34, 332, 5848, 195384, 12432856, 1508087180, 348686105792, 154172619407288, 130573457756588328, 212323461305457440492, 663970589813116610557692, 3999438097971983178736358520, 46462227980008803491191644654968
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