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1/32 the number of (n+1) X 9 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.
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%I #7 Jan 14 2017 09:39:01

%S 2240,823680,346131968,153876579840,70577422755840,33021546171494400,

%T 15664518350357381120,7506428481300850827264,

%U 3625062729947846895239168,1761398107886979915147182080,860111024347049203759900262400

%N 1/32 the number of (n+1) X 9 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.

%C Column 8 of A183772.

%H R. H. Hardin, <a href="/A183771/b183771.txt">Table of n, a(n) for n = 1..29</a>

%e Some solutions for 3 X 9:

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 06 2011