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%I A263421 #4 Oct 17 2015 15:51:59
%S A263421 2,36,1272,26244,532620,11751184,256052940,5521233025,119493228528,
%T A263421 2588597823744,56036432705840,1213019187980625,26261187063569212,
%U A263421 568530651822400656,12307989647701123268,266454168798496644900
%N A263421 Number of nX3 arrays of permutations of 0..n*3-1 with each element moved a city block distance of 0 or 2.
%C A263421 Column 3 of A263424.
%H A263421 R. H. Hardin, <a href="/A263421/b263421.txt">Table of n, a(n) for n = 1..210</a>
%H A263421 R. H. Hardin, <a href="/A263421/a263421.txt">Empirical recurrence of order 64</a>
%F A263421 Empirical recurrence of order 64 (see link above)
%e A263421 Some solutions for n=4
%e A263421 ..2..7..0....4..1..8....2..1..0....6..3..2....4..3..2....0..5..8....6..3..0
%e A263421 ..3.10..1....9..2.11....5..4.11....1..0..7....1..0..5....3..2..1....1..2.11
%e A263421 ..4..5..8....0..7..6....6..3..8....8..5.10....8..7.10....4.11.10....8..9.10
%e A263421 ..9..6.11....3.10..5....7.10..9...11..4..9....9..6.11....9..6..7....7..4..5
%Y A263421 Cf. A263424.
%K A263421 nonn
%O A263421 1,1
%A A263421 _R. H. Hardin_, Oct 17 2015

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