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 A183360 #7 Jul 22 2025 08:51:40 %S A183360 2916,147456,104976,166464,331776,746496,1806336,4460544,9437184, %T A183360 19501056,40144896,84934656,180633600,391090176,840536064,1816805376, %U A183360 3893760000,8387629056,17960288256,38654705664,82833444864,178259595264 %N A183360 One quarter the number of nX8 1..4 arrays with no two neighbors of any element equal to each other. %C A183360 Column 8 of A183362 %H A183360 R. H. Hardin, <a href="/A183360/b183360.txt">Table of n, a(n) for n = 1..38</a> %e A183360 Some solutions for 5X8 with a(1,1)=1 %e A183360 ..1..2..2..3..1..2..2..1....1..2..4..4..1..2..4..4....1..3..4..1..2..2..4..3 %e A183360 ..1..3..4..4..1..3..4..4....1..3..3..2..1..3..3..2....2..2..4..1..3..3..4..1 %e A183360 ..4..3..1..2..2..3..1..2....4..4..1..2..4..4..1..2....4..1..3..2..4..1..2..2 %e A183360 ..2..2..1..3..4..4..1..2....2..2..1..3..3..2..1..3....4..1..3..2..4..1..3..3 %e A183360 ..3..4..4..3..1..2..3..4....3..3..4..4..1..2..4..4....2..2..4..1..3..2..4..1 %K A183360 nonn %O A183360 1,1 %A A183360 _R. H. Hardin_ Jan 04 2011