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
Mon Oct 27 21:16:05 CET 2008 [seqfan] n x n matrices with adjacent entries differing by +/- 1
Mon Oct 27 21:03:00 CET 2008 [seqfan] n x n matrices with adjacent entries differing by +/- 1
Mon Oct 27 20:31:14 CET 2008 [seqfan] n x n matrices with adjacent entries differing by +/- 1
Mon Oct 27 19:39:44 CET 2008 [seqfan] n x n matrices with adjacent entries differing by +/- 1
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