%I #5 Mar 31 2012 12:37:24
%S 8,128,1372,16084,185344,2142580,24754628,286034292,3305009328,
%T 38188137788,441249345280,5098468022268,58910854227068,
%U 680692462409636,7865141904908344,90878716312611076,1050068921631026592
%N Number of 4Xn 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or rightupward antidiagonal neighbors
%C Row 4 of A208709
%H R. H. Hardin, <a href="/A208711/b208711.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 9*a(n1) +31*a(n2) 11*a(n3) 71*a(n4) a(n5) +38*a(n6) 8*a(n7) for n>9
%e Some solutions for n=4
%e ..0..1..0..1....0..1..0..1....0..1..1..0....0..0..0..1....0..0..0..1
%e ..1..0..1..1....1..1..0..1....0..0..1..0....1..0..1..1....1..0..0..0
%e ..0..0..0..1....0..1..1..0....0..0..1..1....0..0..1..0....1..1..1..1
%e ..0..1..0..1....0..0..1..1....1..0..0..0....0..1..0..0....1..0..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 01 2012
