|
%I #7 Apr 19 2020 23:51:28
%S 0,2,25,1461,350649,329985827,1158266740087,15396080290130290,
%T 772462850808202305809,146439171275776627088638614,
%U 104845555459822852114388229089230
%N Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero.
%C Diagonal of A278280.
%H R. H. Hardin, <a href="/A278273/b278273.txt">Table of n, a(n) for n = 1..12</a>
%e Some solutions for n=4
%e ..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..0. .0..1..0..1
%e ..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..1. .0..1..0..1
%e ..1..1..1..0. .0..1..0..1. .0..1..1..0. .0..0..0..1. .1..0..0..0
%e ..1..0..0..1. .0..1..1..1. .1..0..1..1. .0..1..1..0. .0..1..1..0
%Y Cf. A278280.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 16 2016
| 