%I #4 Jan 03 2018 12:29:02
%S 4,8,26,60,176,436,1216,3120,8488,22160,59552,156816,418880,1107712,
%T 2950048,7817664,20789248,55148864,146548736,388957440,1033216640,
%U 2742970624,7285063168,19342708992,51367846912,136396150784,362207435264
%N Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 4 neighboring 1s.
%C Row 2 of A297694.
%H R. H. Hardin, <a href="/A297695/b297695.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 2*a(n-1) +4*a(n-2) -6*a(n-3)
%e Some solutions for n=7
%e ..1..0..0..0..0..1..0. .1..0..1..0..0..0..0. .1..0..0..1..0..1..1
%e ..1..0..1..0..0..1..0. .1..0..0..0..1..0..0. .1..0..1..1..1..1..0
%Y Cf. A297694.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 03 2018