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 A203098 #7 Jul 22 2025 17:01:42 %S A203098 144,143510,87531478,48260497186,27467664499412,15712898935252156, %T A203098 8968410661761080882,5118067454812170831280,2921169534343554102418252, %U A203098 1667264462683367539615630114,951588418839778093530014930652 %N A203098 Number of nX5 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor. %C A203098 Column 5 of A203101 %H A203098 R. H. Hardin, <a href="/A203098/b203098.txt">Table of n, a(n) for n = 1..210</a> %e A203098 Some solutions for n=5 %e A203098 ..2..2..0..1..1....1..3..1..1..1....1..2..1..1..0....3..1..3..1..3 %e A203098 ..2..3..2..0..3....2..3..3..3..0....0..2..0..3..2....3..3..3..1..3 %e A203098 ..2..3..1..2..3....3..1..3..2..2....1..1..0..3..3....3..2..3..0..1 %e A203098 ..3..3..2..3..2....3..2..1..0..0....1..3..0..1..0....1..1..1..2..1 %e A203098 ..3..2..3..3..2....2..3..3..3..0....1..3..2..3..3....2..3..3..2..2 %K A203098 nonn %O A203098 1,1 %A A203098 _R. H. Hardin_ Dec 29 2011