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A050974
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Number of binary arrangements on n X n array without three adjacent 1's in a row or column.
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2
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2, 16, 265, 16561, 3157010, 1828904402, 3323590649777, 18691199385898465, 325778072452564800064, 17617718915229579206450786, 2954164381835835259001326344913, 1536134628973698280539373190731911729
(list; graph; refs; listen; history; internal format)
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