|
%I #4 Apr 18 2013 19:46:05
%S 1048576,2867200,8151040,25056256,100235776,417335296,1816453120,
%T 9114142720,46167923200,236010496000,1298135718400,7150045665280,
%U 39434706558976,226326503372800,1299176162060800,7458911618492416
%N Number of (n+2)X4 0..3 matrices with each 3X3 subblock having the same population
%C Column 2 of A224806
%H R. H. Hardin, <a href="/A224804/b224804.txt">Table of n, a(n) for n = 1..21</a>
%e Some solutions for n=2
%e ..0..0..0..0....0..0..2..0....0..0..0..0....0..0..2..2....0..0..2..0
%e ..2..0..3..2....0..2..2..1....2..2..1..2....1..2..0..0....3..2..2..3
%e ..1..3..0..1....1..2..2..0....0..0..2..0....2..2..3..1....1..2..0..1
%e ..0..0..0..0....0..0..2..0....0..0..0..0....0..2..0..2....0..0..2..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Apr 18 2013
| 