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 A219474 #6 Jul 23 2025 00:30:22 %S A219474 35,239,5040,87083,1227441,14696377,157191488,1532762665,13807624794, %T A219474 116296337706,924459750842,6973773054426,50113925911679, %U A219474 344224992704591,2267656840216326,14372813464098494,87897599949502791,519959958984757538 %N A219474 Number of 4Xn 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 4Xn array. %C A219474 Row 4 of A219471 %H A219474 R. H. Hardin, <a href="/A219474/b219474.txt">Table of n, a(n) for n = 1..92</a> %e A219474 Some solutions for n=3 %e A219474 ..2..2..2....1..1..2....0..0..2....1..1..2....1..1..2....0..0..2....1..1..0 %e A219474 ..2..2..0....2..2..2....0..0..3....1..0..0....1..1..2....0..0..2....0..0..0 %e A219474 ..0..0..0....3..0..0....1..1..2....0..0..0....1..1..3....2..0..0....0..0..2 %e A219474 ..0..0..0....3..0..1....3..1..1....0..1..1....3..3..3....3..0..1....2..1..1 %K A219474 nonn %O A219474 1,1 %A A219474 _R. H. Hardin_ Nov 20 2012