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%I #4 Dec 30 2016 20:54:29
%S 2,384,16860,592416,18844474,566131860,16393550046,462579750172,
%T 12805032188772,349269067529316,9415514952577460,251409624519315024,
%U 6660091714490230910,175258485314498284648,4585645730057094995818
%N Number of nX4 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
%C Column 4 of A280284.
%H R. H. Hardin, <a href="/A280281/b280281.txt">Table of n, a(n) for n = 1..176</a>
%e Some solutions for n=3
%e ..0..1..2..0. .0..1..0..2. .0..1..2..0. .0..1..0..1. .0..1..2..0
%e ..0..2..1..1. .0..1..1..2. .1..0..2..1. .2..2..0..2. .0..1..2..0
%e ..0..1..0..0. .2..2..0..1. .1..1..0..1. .0..1..0..1. .2..1..0..1
%Y Cf. A280284.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 30 2016
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