A223053 - OEIS

A223053

Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

%I #4 Mar 13 2013 04:39:25

%S 0,4,44,508,6918,93770,1302140,18203855,255963118,3621617164,

%T 51457102852,733976768254,10502362067962,150690052903934,

%U 2167251949580988,31234643654675360,450981145373780394,6522104011884246116

%N Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Row 2 of A223052

%H R. H. Hardin, <a href="/A223053/b223053.txt">Table of n, a(n) for n = 1..61</a>

%e Some solutions for n=3

%e ..0..1..0....0..1..2....0..1..0....0..0..1....0..1..0....0..0..1....0..1..0

%e ..1..1..2....2..0..0....1..1..0....1..0..1....2..0..3....2..0..1....2..2..2

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 13 2013