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 A220389 #6 Apr 21 2021 13:47:45 %S A220389 1,65,753,7462,96772,1191846,14300020,173237008,2099827058, %T A220389 25429907185,308015025891,3730748101061,45187679794622, %U A220389 547324309089088,6629322362588949,80295917106362511,972563175651344849 %N A220389 Majority value maps: number of 4 X n binary arrays indicating the locations of corresponding elements equal to at least half of their horizontal and antidiagonal neighbors in a random 0..1 4 X n array. %C A220389 Row 4 of A220386. %H A220389 R. H. Hardin, <a href="/A220389/b220389.txt">Table of n, a(n) for n = 1..29</a> %e A220389 Some solutions for n=3 %e A220389 ..0..0..1....1..0..0....1..1..1....0..1..1....0..1..1....1..1..1....0..1..1 %e A220389 ..1..1..0....0..1..1....0..1..1....1..1..1....1..0..0....0..1..0....1..1..0 %e A220389 ..0..0..1....1..1..1....1..0..0....1..0..1....0..0..0....1..1..1....1..0..1 %e A220389 ..1..0..0....1..0..1....1..1..1....1..1..1....1..1..1....0..0..0....1..1..1 %Y A220389 Cf. A220386. %K A220389 nonn %O A220389 1,2 %A A220389 _R. H. Hardin_ Dec 13 2012