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A191477
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Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 king-move neighboring 1
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1
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2, 5, 15, 92, 716, 8595, 156804, 4204649, 170016558, 10240395108, 922770471915, 124331209274267, 25029189338772296, 7533759271342997075, 3389438730483714015640, 2279436096066483952197622
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