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A263965
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Number of (1+1)X(n+1) arrays of permutations of 0..n*2+1 with each element having index change (+-,+-) 0,0 1,1 or 1,2.
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2
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4, 20, 108, 465, 2265, 10920, 52752, 253176, 1221305, 5885873, 28368956, 136712788, 658952404, 3175970497, 15307435585, 73778034832, 355593913600, 1713880597360, 8260513454657, 39813787812289, 191893397639092, 924882430123988
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