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 A229379 #6 Jul 23 2025 05:42:03 %S A229379 1224,36374,2486980,138118032,8454015792,492938029980,29757371834046, %T A229379 1753378119210848,105365264675732262,6236225995970496338, %U A229379 373776319178643511574,22179629928239882354518,1327081034442636655221164 %N A229379 Number of nX7 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally. %C A229379 Column 7 of A229380 %H A229379 R. H. Hardin, <a href="/A229379/b229379.txt">Table of n, a(n) for n = 1..210</a> %e A229379 Some solutions for n=3 %e A229379 ..0..0..1..0..1..0..0....0..0..0..1..2..0..1....0..0..1..0..1..0..2 %e A229379 ..1..2..2..1..2..1..2....1..2..2..2..1..2..1....1..2..1..2..1..0..1 %e A229379 ..0..1..0..1..0..2..0....2..0..0..0..0..1..0....2..0..2..0..1..2..1 %K A229379 nonn %O A229379 1,1 %A A229379 _R. H. Hardin_ Sep 21 2013