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 A206699 #7 Jul 22 2025 19:37:38 %S A206699 1791,3207681,4428597297,6043775871265,8149739471342829, %T A206699 10977508218092030949,14777630573426014735558, %U A206699 19891697466939518338949937,26774752595905814904083950218,36039345751281018973667189182614 %N A206699 Number of nX7 0..2 arrays avoiding the pattern z-2 z-1 z in any row or column. %C A206699 Column 7 of A206700 %H A206699 R. H. Hardin, <a href="/A206699/b206699.txt">Table of n, a(n) for n = 1..210</a> %e A206699 Some solutions for n=4 %e A206699 ..0..1..0..1..1..0..1....2..0..1..0..0..2..1....2..0..0..0..2..0..0 %e A206699 ..0..1..0..0..0..0..0....1..2..0..0..1..0..2....1..1..1..0..1..0..2 %e A206699 ..0..0..2..2..2..2..1....2..1..2..1..0..2..2....1..0..1..1..0..0..2 %e A206699 ..0..2..0..1..0..2..1....0..0..2..1..0..1..0....0..0..0..0..1..1..0 %K A206699 nonn %O A206699 1,1 %A A206699 _R. H. Hardin_ Feb 11 2012