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A297540 Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s.

%I A297540 #4 Dec 31 2017 15:00:51
%S A297540 1,24,93,275,2205,13248,67215,401415,2403621,13717554,79734011,
%T A297540 467605069,2718919839,15817878296,92253538261,537481451021,
%U A297540 3130277448285,18239061232932,106267286686423,619075960613237,3606738104606245
%N A297540 Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s.
%C A297540 Column 4 of A297544.
%H A297540 R. H. Hardin, <a href="/A297540/b297540.txt">Table of n, a(n) for n = 1..210</a>
%F A297540 Empirical: a(n) = 4*a(n-1) +6*a(n-2) +48*a(n-3) -58*a(n-4) -327*a(n-5) -368*a(n-6) +322*a(n-7) +1099*a(n-8) +949*a(n-9) +1014*a(n-10) +648*a(n-11) +1037*a(n-12) +38*a(n-13) -301*a(n-14) -141*a(n-15) -197*a(n-16) -151*a(n-17) -27*a(n-18) +33*a(n-19) +32*a(n-20) +3*a(n-21) -2*a(n-22)
%e A297540 Some solutions for n=5
%e A297540 ..0..1..1..0. .1..1..0..0. .0..0..1..1. .0..0..1..0. .0..1..0..0
%e A297540 ..0..0..1..1. .1..1..0..0. .0..1..1..0. .0..1..1..1. .1..0..1..0
%e A297540 ..0..1..0..0. .1..1..0..0. .1..0..0..0. .1..0..0..1. .0..1..0..0
%e A297540 ..1..1..0..0. .1..1..0..0. .0..1..1..0. .0..1..1..0. .0..1..1..0
%e A297540 ..1..1..0..0. .0..0..0..0. .1..1..0..0. .1..1..0..0. .0..1..1..0
%Y A297540 Cf. A297544.
%K A297540 nonn
%O A297540 1,2
%A A297540 _R. H. Hardin_, Dec 31 2017