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 A220388 #6 Jul 23 2025 01:07:42 %S A220388 1,21,136,757,5114,33247,211944,1358599,8710809,55837516,357929465, %T A220388 2294335738,14706528192,94267737477,604248583206,3873181842138, %U A220388 24826757202429,159137319721129,1020056076249840,6538468564699587 %N A220388 Majority value maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to at least half of their horizontal and antidiagonal neighbors in a random 0..1 3Xn array. %C A220388 Row 3 of A220386 %H A220388 R. H. Hardin, <a href="/A220388/b220388.txt">Table of n, a(n) for n = 1..67</a> %e A220388 Some solutions for n=3 %e A220388 ..1..0..1....0..0..0....0..0..1....1..0..1....0..0..0....0..0..1....1..1..1 %e A220388 ..1..1..0....1..1..1....1..1..0....1..1..1....1..1..0....0..1..0....0..1..0 %e A220388 ..0..0..0....1..0..0....1..0..0....1..1..1....1..0..0....1..1..1....1..1..1 %K A220388 nonn %O A220388 1,2 %A A220388 _R. H. Hardin_ Dec 13 2012