A227677 - OEIS

%I #5 Aug 11 2014 22:45:53

%S 11,131,1343,11971,90884,592791,3380440,17161921,78807477,331649881,

%T 1292860261,4709556398,16147197916,52422604429,161978060979,

%U 478412562214,1355794408584,3698766477709,9741946309658,24835300279682,61420677587519

%N Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order

%C Column 4 of A227679

%H R. H. Hardin, <a href="/A227677/b227677.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A227677/a227677.txt">Empirical polynomial of degree 30</a>

%F Empirical polynomial of degree 30 (see link above)

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 19 2013