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 A206892 #7 Jul 22 2025 19:47:28 %S A206892 33,1089,20129,330951,5963040,111550389,2067672443,37988878275, %T A206892 698017127422,12848172794534,236570382445377,4354636068325921, %U A206892 80147467353233653,1475176781227114397,27152663805860158867 %N A206892 Number of 6Xn 0..1 arrays avoiding 0 1 0 horizontally and 1 0 0 vertically. %C A206892 Row 6 of A206889 %H A206892 R. H. Hardin, <a href="/A206892/b206892.txt">Table of n, a(n) for n = 1..210</a> %e A206892 Some solutions for n=4 %e A206892 ..1..1..1..1....0..1..1..1....0..0..0..1....1..1..1..0....0..0..1..1 %e A206892 ..1..1..1..1....1..0..1..1....0..1..1..0....1..0..1..1....0..1..1..0 %e A206892 ..1..1..1..1....1..1..0..1....1..0..1..1....0..1..1..1....1..0..1..1 %e A206892 ..1..1..1..1....1..1..1..1....1..1..0..1....1..0..1..1....1..1..0..0 %e A206892 ..1..0..1..1....0..1..1..0....1..1..1..0....1..1..0..1....1..0..1..1 %e A206892 ..1..1..1..1....1..0..1..1....0..0..0..1....0..1..1..1....1..1..0..0 %K A206892 nonn %O A206892 1,1 %A A206892 _R. H. Hardin_ Feb 13 2012