**Number of ways to number the cells of an n X n square grid with 1,2,3,...,n^2 so that successive integers are in adjacent cells (horizontally or vertically).**

*1, 8, 40, 552, 8648, 458696, 2707056*

*1 seqfan posts*

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

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