cp's OEIS Frontend

A209679 Number of n X n 0..4 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.

%I A209679 #10 Jul 22 2025 21:53:48
%S A209679 1,15,1243,2143147,6713848491,336865786047147,29579506766774446763,
%T A209679 41557077253870074781674155,102173227506131465827954312522411,
%U A209679 4019288788864555869108044364449353214635
%N A209679 Number of n X n 0..4 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.
%C A209679 Column 3 of A209684
%H A209679 R. H. Hardin, <a href="/A209679/b209679.txt">Table of n, a(n) for n = 1..51</a>
%e A209679 Some.solutions.for.n=3
%e A209679 ..0..1..2....0..1..0....0..1..2....0..1..1....0..1..0....0..1..0....0..1..2
%e A209679 ..1..3..0....1..1..0....3..3..1....1..0..2....1..2..2....2..0..1....1..1..3
%e A209679 ..0..0..1....0..0..0....3..3..0....1..2..1....0..2..0....2..2..1....3..3..0
%K A209679 nonn
%O A209679 1,2
%A A209679 _R. H. Hardin_ Mar 11 2012