A222568 - OEIS

%I #4 Feb 25 2013 05:52:07

%S 1,5,11,120,500,5210,20889,229894,913405,10427244,40896923,479942958,

%T 1866795781,22316526370,86377362833,1045093746614,4036724271985,

%U 49216523120074,190041618262033,2328483132653366,8997015510376997

%N Number of nX3 0..2 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Column 3 of A222573

%H R. H. Hardin, <a href="/A222568/b222568.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 25 2013