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 A221692 #6 Jul 23 2025 02:07:17 %S A221692 60,92660,74531185,64509677154,55433846144035,47681199145323119, %T A221692 41016076097898190730,35282822653645381320038, %U A221692 30350969754572497969358415,26108492570724327368100591178,22459031054635514974048155933027 %N A221692 Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction. %C A221692 Column 6 of A221693 %H A221692 R. H. Hardin, <a href="/A221692/b221692.txt">Table of n, a(n) for n = 1..25</a> %e A221692 Some solutions for n=3 %e A221692 ..0..1..0..2..1..2....0..1..0..1..1..0....0..1..0..1..2..0....0..1..0..2..1..1 %e A221692 ..1..1..0..0..1..1....1..1..3..1..1..0....1..1..3..1..1..0....1..1..1..1..0..1 %e A221692 ..1..4..0..0..3..0....1..2..1..3..0..1....1..1..1..0..3..1....1..1..2..1..1..2 %K A221692 nonn %O A221692 1,1 %A A221692 _R. H. Hardin_ Jan 22 2013