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A069448
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Half the number of 3 X n binary arrays with no path of adjacent 1's or adjacent 0's from top to bottom or side to side.
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92
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3, 35, 269, 1723, 10123, 56757, 309755, 1663515, 8846821, 46767491, 246319875, 1294402053, 6792548971, 35614277883, 186632524741, 977711862035, 5120933346419
(list; graph; refs; listen; history; internal format)
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