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A264273
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Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,0 or 1,2.
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1
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9, 48, 256, 1280, 6400, 32000, 160000, 800000, 4000000, 20000000, 100000000, 500000000, 2500000000, 12500000000, 62500000000, 312500000000, 1562500000000, 7812500000000, 39062500000000, 195312500000000, 976562500000000
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