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 A218844 #6 Jul 23 2025 00:07:09 %S A218844 1,21,93,453,2050,9516,44129,204780,950346,4410194,20465923,94974721, %T A218844 440743516,2045330613,9491634200,44047218242,204407115009, %U A218844 948579057090,4402010267626,20428127976053,94799509246526,439930030199648 %N A218844 Unmatched value maps: number of 3Xn binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 3Xn array. %C A218844 Row 3 of A218842 %H A218844 R. H. Hardin, <a href="/A218844/b218844.txt">Table of n, a(n) for n = 1..53</a> %e A218844 Some solutions for n=3 %e A218844 ..1..0..1....0..0..1....0..0..1....1..0..0....1..1..1....1..0..0....1..0..1 %e A218844 ..0..0..1....0..0..1....0..0..0....0..0..1....1..1..1....0..0..0....0..0..1 %e A218844 ..0..0..1....0..0..1....0..0..0....1..1..1....1..0..0....0..1..1....0..0..0 %K A218844 nonn %O A218844 1,2 %A A218844 _R. H. Hardin_ Nov 07 2012