cp's OEIS Frontend

A230172 Number of n X 4 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

%I A230172 #9 Feb 22 2025 14:36:10
%S A230172 9,1407,78849,4722977,284444079,17072965263,1027868078181,
%T A230172 61861526624839,3721702070420191,223920929460093089,
%U A230172 13473042937456532657,810647385075641076549,48774886700839338028985,2934683063063203660000047,176573841926955569266738003,10624082602448862037038864007
%N A230172 Number of n X 4 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j).
%H A230172 R. H. Hardin, <a href="/A230172/b230172.txt">Table of n, a(n) for n = 1..210</a>
%H A230172 R. H. Hardin, <a href="/A230172/a230172.txt">Empirical recurrence of order 81</a>
%F A230172 Empirical recurrence of order 81 (see link above).
%e A230172 Some solutions for n=3:
%e A230172 ..2..0..1..1....0..2..2..0....2..1..0..2....0..0..0..2....0..0..0..2
%e A230172 ..2..0..2..2....1..1..2..0....2..0..1..0....2..1..1..0....0..2..2..0
%e A230172 ..0..2..0..0....1..0..0..0....0..1..2..0....0..0..0..2....2..2..0..0
%Y A230172 Column 4 of A230176.
%K A230172 nonn
%O A230172 1,1
%A A230172 _R. H. Hardin_, Oct 11 2013