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 A206862 #6 Jul 22 2025 19:44:17 %S A206862 1465,2146225,1090023439,541018725304,303316860005399, %T A206862 169438223533971179,92792498733436652359,50788865481935185946431 %N A206862 Number of nX7 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal. %C A206862 Column 7 of A206863 %e A206862 Some solutions for n=4 %e A206862 ..0..2..2..2..1..1..0....1..1..0..1..1..1..1....1..2..2..0..1..2..2 %e A206862 ..2..2..0..1..1..1..2....1..0..0..0..1..2..2....2..1..0..1..2..2..2 %e A206862 ..0..2..1..0..2..0..1....0..2..1..0..2..2..2....2..1..1..1..0..2..2 %e A206862 ..0..0..1..2..2..0..0....0..2..2..2..2..2..0....1..2..2..2..2..1..2 %K A206862 nonn %O A206862 1,1 %A A206862 _R. H. Hardin_ Feb 13 2012