%I #3 Mar 31 2012 12:35:49

%S 1,3,17,227,6743,454385,69050253,23720149995,18403310404291,

%T 32260116141540213,127750070550172845235,1142905840646183024996181,

%U 23099457587377397021217958619,1054727887880873003123899368746005

%N Number of nX(n+1) binary matrices with no initial bit string in any row or column divisible by 4

%C Superdiagonal 1 of A181031

%H R. H. Hardin, <a href="/A181032/b181032.txt">Table of n, a(n) for n=1..22</a>

%e Some solutions for 4X5

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Sep 30 2010