cp's OEIS Frontend

A189265 Number of 3Xn binary arrays without the pattern 0 0 1 diagonally, antidiagonally or horizontally.

%I A189265 #7 Jul 22 2025 11:39:10
%S A189265 8,64,280,1156,4720,18960,74869,293495,1143065,4435997,17166670,
%T A189265 66321486,255904884,986647975,3801894402,14644645685,56395631397,
%U A189265 217139104510,835947689845,3217998048544,12387073741629,47679941911196
%N A189265 Number of 3Xn binary arrays without the pattern 0 0 1 diagonally, antidiagonally or horizontally.
%C A189265 Row 3 of A189264
%H A189265 R. H. Hardin, <a href="/A189265/b189265.txt">Table of n, a(n) for n = 1..200</a>
%F A189265 Empirical: a(n) = 6*a(n-1) +4*a(n-2) -71*a(n-3) +33*a(n-4) +318*a(n-5) -222*a(n-6) -671*a(n-7) +384*a(n-8) +626*a(n-9) +97*a(n-10) -36*a(n-11) -926*a(n-12) -422*a(n-13) +858*a(n-14) +428*a(n-15) -119*a(n-16) -274*a(n-17) -183*a(n-18) +127*a(n-19) +86*a(n-20) -35*a(n-21) -11*a(n-22) +4*a(n-23) for n>26
%e A189265 Some solutions for 3X3
%e A189265 ..1..1..0....1..1..0....0..1..1....1..1..1....1..0..1....1..0..0....1..1..0
%e A189265 ..0..1..1....1..1..0....0..1..0....0..0..0....1..1..0....1..1..0....1..1..0
%e A189265 ..1..1..0....1..1..1....0..0..0....0..1..1....0..0..0....1..0..0....1..0..1
%K A189265 nonn
%O A189265 1,1
%A A189265 _R. H. Hardin_ Apr 19 2011