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 A207703 #7 Feb 08 2022 12:09:52 %S A207703 2,4,4,6,16,6,9,36,36,8,15,81,102,64,10,25,225,289,216,100,12,40,625, %T A207703 1071,729,390,144,14,64,1600,3969,3321,1521,636,196,16,104,4096,13230, %U A207703 15129,8151,2809,966,256,18,169,10816,44100,61254,43681,17225,4761,1392 %N A207703 T(n,k) = Number of n X k 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically. %C A207703 Table starts %C A207703 ..2...4....6....9....15.....25......40.......64.......104.......169........273 %C A207703 ..4..16...36...81...225....625....1600.....4096.....10816.....28561......74529 %C A207703 ..6..36..102..289..1071...3969...13230....44100....153090....531441....1815939 %C A207703 ..8..64..216..729..3321..15129...61254...248004...1050282...4447881...18510693 %C A207703 .10.100..390.1521..8151..43681..206910...980100...4863870..24137569..117661437 %C A207703 .12.144..636.2809.17225.105625..571350..3090564..17518470..99301225..552967815 %C A207703 .14.196..966.4761.32775.225625.1369900..8317456..52895444.336392281.2102483853 %C A207703 .16.256.1392.7569.57681.439569.2956980.19891600.140048460.986022801.6826106385 %H A207703 R. H. Hardin, <a href="/A207703/b207703.txt">Table of n, a(n) for n = 1..650</a> %e A207703 Some solutions for n=4, k=3 %e A207703 ..1..0..0....1..1..0....0..1..1....0..0..1....1..1..1....1..0..0....1..1..0 %e A207703 ..0..0..1....0..0..1....1..1..0....1..0..0....1..1..1....1..0..1....1..0..1 %e A207703 ..1..0..1....1..1..1....1..1..1....0..0..1....1..1..1....1..0..1....1..0..0 %e A207703 ..0..0..1....1..0..1....1..1..1....0..0..1....1..1..1....1..0..1....1..0..1 %Y A207703 Column 2 is A016742. %Y A207703 Column 3 is A086113. %Y A207703 Column 4 is A207399. %Y A207703 Row 1 is A006498(n+2). %Y A207703 Row 2 is A189145(n+2). %K A207703 nonn,tabl %O A207703 1,1 %A A207703 _R. H. Hardin_, Feb 19 2012