cp's OEIS Frontend

A230649 Number of nX5 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).

%I A230649 #6 Jun 02 2025 08:43:52
%S A230649 0,15,27,531,1635,28161,90393,1539207,4956927,84335553,271665969,
%T A230649 4621740687,14888070495,253283346081,815905965057,13880597644287,
%U A230649 44713811014239,760693546670625,2450435395047009,41688023124390687
%N A230649 Number of nX5 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).
%C A230649 Column 5 of A230652
%H A230649 R. H. Hardin, <a href="/A230649/b230649.txt">Table of n, a(n) for n = 1..210</a>
%F A230649 Empirical: a(n) = 59*a(n-2) -230*a(n-4) -2*a(n-6) +32*a(n-8) for n>11
%e A230649 Some solutions for n=5
%e A230649 ..0..x..0..x..0....2..x..2..x..1....1..x..1..x..0....2..x..2..x..0
%e A230649 ..x..2..x..2..x....x..0..x..1..x....x..1..x..2..x....x..0..x..2..x
%e A230649 ..0..x..1..x..0....2..x..1..x..1....0..x..1..x..0....2..x..2..x..1
%e A230649 ..x..0..x..1..x....x..1..x..2..x....x..2..x..0..x....x..0..x..1..x
%e A230649 ..2..x..1..x..1....1..x..1..x..0....0..x..0..x..2....2..x..1..x..1
%K A230649 nonn
%O A230649 1,2
%A A230649 _R. H. Hardin_, Oct 27 2013