**a(n) is the number of n by n matrices with entries in {1,2,3} such that all adjacent entries (in the same row or column) differ by 1 or -1.**

*3, 8, 48, 512, 12288, 524288, 50331648, 8589934592, 3298534883328*

*4 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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