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 A219467 #6 Jul 23 2025 00:29:44 %S A219467 20,211,4838,87083,1306891,17399442,208345624,2285009931,23253970439, %T A219467 221258732227,1979908560027,16752069750566,134676183213583, %U A219467 1033204910207865,7592661274649504,53621665489883610,364978798507011324 %N A219467 Number of nX4 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 nX4 array. %C A219467 Column 4 of A219471 %H A219467 R. H. Hardin, <a href="/A219467/b219467.txt">Table of n, a(n) for n = 1..210</a> %e A219467 Some solutions for n=3 %e A219467 ..0..0..0..2....2..2..2..2....1..1..1..3....0..0..1..2....0..0..0..1 %e A219467 ..0..0..1..2....2..2..0..0....1..2..2..3....1..1..0..0....0..0..2..1 %e A219467 ..1..2..0..0....0..0..0..2....2..2..3..3....3..0..0..0....0..0..1..1 %K A219467 nonn %O A219467 1,1 %A A219467 _R. H. Hardin_ Nov 20 2012