|
%I #4 Feb 07 2014 04:54:41
%S 288,1164,4760,20812,90528,393456,1707488,7460608,32509760,141269808,
%T 613267808,2679432304,11675906432,50736815168,220255387008,
%U 962317756288,4193401642752,18222123217856,79104715510144,345616379670720
%N Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median plus the lower median plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 2 of A237375
%H R. H. Hardin, <a href="/A237369/b237369.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 370*a(n-4) -3916*a(n-8) +6904*a(n-12) -1984*a(n-16) for n>18
%e Some solutions for n=5
%e ..1..2..2....2..2..1....1..2..2....0..1..0....2..0..1....0..2..0....0..2..0
%e ..1..0..1....0..2..0....2..1..2....1..1..0....2..1..2....1..2..2....1..1..2
%e ..1..1..2....1..2..0....2..2..1....2..0..2....0..1..1....1..2..1....1..2..1
%e ..0..2..0....0..1..2....2..0..2....0..1..1....2..0..2....1..1..2....1..2..0
%e ..0..1..1....2..0..1....1..2..0....1..0..1....1..1..2....0..2..0....2..2..2
%e ..0..1..0....0..0..2....2..1..2....2..0..1....1..2..1....2..1..1....1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 07 2014
| 