%I
%S 76,684,4740,35672,260172,1923780,14150114,104300522,768160718,
%T 5659345888,41689048326,307115065572,2262407666898,16666499139956,
%U 122776828884698,904459332925242,6662871472736956,49083319176509768
%N Number of (n+1)X4 binary arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant
%C Column 3 of A185487
%H R. H. Hardin, <a href="/A185481/b185481.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n)=11*a(n1)23*a(n2)69*a(n3)+409*a(n4)768*a(n5)571*a(n6)+4622*a(n7)5573*a(n8)+1199*a(n9)+2111*a(n10)8400*a(n11)+12500*a(n12)4419*a(n13)490*a(n14)+204*a(n15)1290*a(n16)+1264*a(n17)1204*a(n18)+320*a(n19) for n>22
%e Some solutions for 3X4
%e ..0..1..0..1....0..0..0..0....1..0..0..0....0..0..1..1....0..0..1..1
%e ..0..1..0..1....0..1..1..0....1..1..0..0....0..0..1..1....0..0..0..0
%e ..0..1..0..0....0..0..1..1....0..1..0..1....0..1..1..0....1..0..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 28 2011
