A209682 - OEIS

%I #6 Dec 18 2015 18:18:05

%S 1,15,1551,13575355,584728215424,1568091719977974635,

%T 8230385298024619110939311,2126394147054521999411737472214659,

%U 1020701618427502395624813185662022237910866

%N Number of n X n 0..7 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order

%C Column 6 of A209684

%H R. H. Hardin, <a href="/A209682/b209682.txt">Table of n, a(n) for n = 1..44</a>

%e Some solutions for n=3

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

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

%e ..2..2..1....1..1..1....1..2..1....0..2..1....2..2..0....3..2..1....2..1..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 11 2012