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A141440
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Number of n X n integer matrices, symmetric under horizontal reflection, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
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1
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1, 3, 121, 771, 317259, 4380445, 18838482047, 567241901289, 25690815631493191, 1691995329032459285, 809857047207692689731131, 116848319343974137914103093, 592161880926391194661929563951461
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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