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 A209741 #7 Jul 22 2025 21:56:41 %S A209741 52,10594,6262064,4474325828,3309942226828,2462887498725440, %T A209741 1834383283218723590,1366486932112899379170,1017964144833296194871291, %U A209741 758335528163948847329102970,564924804927465477617885477572 %N A209741 Number of nX5 0..5 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..5 introduced in row major order. %C A209741 Column 5 of A209744 %H A209741 R. H. Hardin, <a href="/A209741/b209741.txt">Table of n, a(n) for n = 1..210</a> %e A209741 Some solutions for n=5 %e A209741 ..0..0..0..0..1....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 %e A209741 ..1..2..3..1..2....1..2..1..2..1....1..2..1..2..1....1..2..1..2..3 %e A209741 ..0..0..3..0..0....0..0..0..0..0....1..3..3..1..3....4..1..3..1..1 %e A209741 ..1..2..0..4..1....1..2..1..2..1....3..0..1..4..1....3..1..0..0..2 %e A209741 ..4..2..5..4..5....0..0..1..0..0....4..0..2..4..5....5..5..5..4..0 %K A209741 nonn %O A209741 1,1 %A A209741 _R. H. Hardin_ Mar 12 2012