This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A189198 #7 Jul 22 2025 11:37:06 %S A189198 20,400,6446,101628,1579664,24496092,379515360,5878642448,91053926856, %T A189198 1410308064720,21843768123936,338330131913680,5240270191277760, %U A189198 81164599671831296,1257128330483644640,19471193573584406720 %N A189198 Number of 5Xn binary arrays without the pattern 0 0 1 vertically or antidiagonally. %C A189198 Row 5 of A189196 %H A189198 R. H. Hardin, <a href="/A189198/b189198.txt">Table of n, a(n) for n = 1..200</a> %F A189198 Empirical: a(n) = 20*a(n-1) -60*a(n-2) -208*a(n-3) +844*a(n-4) +344*a(n-5) -3476*a(n-6) +3544*a(n-7) -1056*a(n-8) %e A189198 Some solutions for 5X3 %e A189198 ..1..1..0....1..1..0....0..1..1....0..1..1....1..0..1....0..0..1....1..0..1 %e A189198 ..0..1..1....1..1..1....0..0..1....0..1..1....1..1..0....0..1..0....0..1..1 %e A189198 ..1..1..1....0..1..0....0..1..1....0..0..0....0..1..1....0..1..1....1..1..1 %e A189198 ..1..1..0....1..1..1....0..0..0....0..0..1....1..1..1....0..1..0....1..0..1 %e A189198 ..0..1..1....0..0..0....0..1..0....0..0..0....0..0..0....0..0..1....0..1..0 %K A189198 nonn %O A189198 1,1 %A A189198 _R. H. Hardin_ Apr 18 2011