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 A221027 #5 Jul 23 2025 01:38:10 %S A221027 7,13,19,27,35,42,45,53,62,69,72,83,90,95,101,112,119,125,131,139,147, %T A221027 154,154,168,175,181,187,195,203,210,213 %N A221027 Sum of neighbor maps: log base 2 of the number of nX7 binary arrays indicating the locations of corresponding elements equal to the sum mod 2 of their horizontal, vertical and antidiagonal neighbors in a random 0..1 nX7 array. %C A221027 Column 7 of A221028 %e A221027 Some solutions for n=3 %e A221027 ..0..0..0..1..1..0..1....0..0..0..1..0..1..1....0..1..1..0..1..0..0 %e A221027 ..0..1..1..0..0..0..0....0..0..1..1..1..0..0....0..1..1..1..1..0..0 %e A221027 ..0..0..0..1..1..0..0....1..0..1..0..0..1..0....0..0..0..0..0..1..1 %K A221027 nonn %O A221027 1,1 %A A221027 _R. H. Hardin_ Dec 29 2012