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 A196298 #7 Jun 02 2025 04:20:35 %S A196298 16,536,4988,97892,1752855,29726608,513362648,9011375854,157499416616, %T A196298 2741611675889,47786154938133,835079584650718,14574818807228610, %U A196298 254227577927404022,4437435057747448441,77465536560470518968 %N A196298 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,4,2 for x=0,1,2,3,4. %C A196298 Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 4's, every 4 is next to 4 2's %C A196298 Column 6 of A196300 %H A196298 R. H. Hardin, <a href="/A196298/b196298.txt">Table of n, a(n) for n = 1..188</a> %e A196298 Some solutions for n=4 %e A196298 ..0..0..2..1..2..0....1..0..0..0..0..1....0..1..1..0..1..1....1..1..1..1..0..1 %e A196298 ..0..2..1..0..1..1....1..0..0..0..0..1....0..1..2..2..1..0....0..0..0..2..0..2 %e A196298 ..0..1..1..0..2..1....1..0..0..0..2..1....0..2..2..1..1..0....0..0..2..1..2..1 %e A196298 ..0..1..2..0..0..0....2..1..1..1..1..0....0..1..1..0..1..1....1..2..1..0..0..0 %K A196298 nonn %O A196298 1,1 %A A196298 _R. H. Hardin_ Sep 30 2011