|
%I #6 Apr 05 2020 23:06:09
%S 1,6,97,442,4892,26226,256732,1544872,14082710,91677088,797188437,
%T 5483647480,46175013577,330178554834,2719685483708,19987724476418,
%U 162187667549290,1215451639260848,9763451129789048,74199887341866168
%N Number of n X 3 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1.
%C Column 3 of A285030.
%H R. H. Hardin, <a href="/A285025/b285025.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..0..1. .1..1..1. .0..1..1. .1..1..1. .1..0..0. .0..0..1. .0..1..1
%e ..0..1..0. .1..1..0. .0..0..0. .0..0..1. .1..1..1. .0..1..1. .0..1..0
%e ..1..0..1. .0..1..0. .1..1..0. .0..0..0. .0..0..0. .0..0..1. .0..0..1
%e ..0..0..1. .0..0..0. .1..0..0. .0..1..0. .0..0..0. .1..0..0. .0..0..1
%Y Cf. A285030.
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 08 2017
| 