A269041 - OEIS

%I #4 Feb 18 2016 09:05:06

%S 0,25272,357756,8277072,159397596,3266423688,63310818360,

%T 1232016734502,23480085224460,445037745455958,8347562556153996,

%U 155656709783860410,2883687582601214532,53163977044543395168,975616567564729165860

%N Number of 7Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

%C Row 7 of A269035.

%H R. H. Hardin, <a href="/A269041/b269041.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A269041/a269041.txt">Empirical recurrence of order 92</a>

%F Empirical recurrence of order 92 (see link above)

%e Some solutions for n=2

%e ..0..0. .1..2. .2..2. .0..0. .1..2. .1..0. .1..0. .1..2. .1..0. .2..2

%e ..1..1. .1..2. .2..1. .1..0. .2..2. .0..2. .1..0. .1..0. .1..0. .2..1

%e ..2..2. .1..0. .0..1. .1..2. .2..1. .1..0. .0..0. .1..2. .2..2. .0..1

%e ..2..1. .0..1. .0..0. .2..0. .0..2. .1..2. .1..2. .2..2. .2..2. .2..1

%e ..2..2. .0..1. .0..0. .1..2. .2..1. .1..0. .1..0. .1..0. .2..1. .1..2

%e ..2..1. .0..1. .1..0. .2..2. .2..2. .1..2. .0..0. .1..2. .2..2. .1..0

%e ..2..1. .0..1. .2..2. .2..1. .2..2. .1..0. .0..1. .2..2. .2..2. .0..0

%Y Cf. A269035.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 18 2016