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 A217966 #8 Jul 22 2025 23:44:57 %S A217966 27,77,835,5415,45043,336927,2675127,20711527,162237197,1264467637, %T A217966 9878676929,77096409709,601984698319,4699383563019,36689365591653, %U A217966 286431238079077,2236192425051273,17457988805711127,136295317877977821 %N A217966 Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..2 3Xn array. %C A217966 Row 3 of A217964 %H A217966 R. H. Hardin, <a href="/A217966/b217966.txt">Table of n, a(n) for n = 1..32</a> %e A217966 Some solutions for n=3 %e A217966 ..0..0..0....1..1..1....2..0..0....2..2..2....0..0..0....2..0..2....1..0..0 %e A217966 ..1..0..1....2..0..0....2..0..1....2..2..1....2..0..1....0..0..2....0..0..1 %e A217966 ..1..2..2....0..0..1....2..0..0....1..1..1....2..1..1....0..0..2....1..0..0 %K A217966 nonn %O A217966 1,1 %A A217966 _R. H. Hardin_ Oct 16 2012