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A230509
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Number of n X 2 0..7 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 8, and upper left element zero.
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2
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0, 0, 0, 2, 8, 32, 118, 440, 1664, 6354, 24360, 93440, 358246, 1372824, 5259424, 20147874, 77183048, 295680992, 1132742102, 4339515256, 16624624832, 63688678130, 243990165864, 934721535168, 3580899428294, 13718353772632
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