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A263440 Number of nX2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 3.

%I A263440 #5 Oct 18 2015 11:01:42
%S A263440 1,1,4,25,125,633,2532,10288,48776,233776,1080228,4996113,23080949,
%T A263440 107157345,501507348,2345998289,10947914825,51111745065,238823109920,
%U A263440 1116507049088,5221116919456,24414616690816,114158428564416
%N A263440 Number of nX2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 3.
%C A263440 Column 2 of A263442.
%H A263440 R. H. Hardin, <a href="/A263440/b263440.txt">Table of n, a(n) for n = 1..210</a>
%e A263440 Some solutions for n=4
%e A263440 ..0..7....5..7....5..1....0..4....0..1....0..4....0..1....6..4....5..1....0..4
%e A263440 ..2..6....2..6....2..3....2..6....7..6....7..6....7..3....2..3....7..6....2..3
%e A263440 ..4..5....4..0....4..0....1..5....4..5....1..5....4..5....1..5....4..0....1..5
%e A263440 ..3..1....3..1....6..7....3..7....3..2....3..2....6..2....0..7....3..2....6..7
%Y A263440 Cf. A263442.
%K A263440 nonn
%O A263440 1,3
%A A263440 _R. H. Hardin_, Oct 18 2015