|
%I #4 Oct 16 2015 11:25:16
%S 16,1600,70225,2205225,85599504,3623076864,146943422224,5787820712521,
%T 230179176125649,9243027274360896,370481900615995536,
%U 14801700800476792449,591533534101543481889,23664671468723798926336
%N Number of (n+1)X(3+1) arrays of permutations of 0..n*3-1 with each element moved a city block distance of exactly 2.
%C Column 3 of A263389.
%H R. H. Hardin, <a href="/A263387/b263387.txt">Table of n, a(n) for n = 1..145</a>
%e Some solutions for n=3
%e ..8..3..7..6....5..4..7..6....8..3.10.11....2..9..7..6....2..6..5.11
%e ..1.10..9..2...12.13..9.15....1.13.14..2....1.10.11..5....9..8..4.10
%e ..0.11.15.14....0..1..2..3....0..6..5..9....0..4..8..3....0..1.13..3
%e ..4..5.12.13...14..8.11.10....4.15.12..7...14.15.12.13...14.15.12..7
%Y Cf. A263389.
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 16 2015
| 