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 A207762 #7 Jul 22 2025 20:48:40 %S A207762 2,4,4,6,16,6,9,36,36,9,13,81,82,81,14,19,169,221,193,196,21,28,361, %T A207762 493,663,488,441,31,41,784,1095,1664,2245,1087,961,46,60,1681,2654, %U A207762 4018,6552,6459,2305,2116,68,88,3600,6203,11509,16920,21547,17563,4932,4624,100 %N A207762 T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 0 1 vertically. %C A207762 Table starts %C A207762 ..2....4....6.....9.....13.....19......28.......41.......60........88 %C A207762 ..4...16...36....81....169....361.....784.....1681.....3600......7744 %C A207762 ..6...36...82...221....493...1095....2654.....6203....14182.....33242 %C A207762 ..9...81..193...663...1664...4018...11509....30943....79178....213444 %C A207762 .14..196..488..2245...6552..16920...59252...188350...538950...1709438 %C A207762 .21..441.1087..6459..21547..56651..235872...862146..2629798...9529570 %C A207762 .31..961.2305.17563..67330.178627..887114..3733566.11979209..49800326 %C A207762 .46.2116.4932.48649.217902.581166.3488718.17141340.57575203.278302021 %H A207762 R. H. Hardin, <a href="/A207762/b207762.txt">Table of n, a(n) for n = 1..684</a> %e A207762 Some solutions for n=4 k=3 %e A207762 ..0..0..1....1..1..1....0..1..1....1..1..1....1..0..0....1..1..1....1..0..0 %e A207762 ..0..1..1....1..1..0....0..0..1....1..0..0....1..0..0....1..0..0....1..1..0 %e A207762 ..0..0..1....1..0..0....1..0..0....1..0..0....1..1..0....1..0..0....1..0..0 %e A207762 ..0..0..1....1..0..0....0..1..0....0..1..1....0..0..1....1..0..0....1..0..0 %Y A207762 Column 1 is A038718(n+2) %Y A207762 Column 2 is A207069 %Y A207762 Column 3 is A207264 %Y A207762 Row 1 is A000930(n+3) %Y A207762 Row 2 is A207170 %K A207762 nonn,tabl %O A207762 1,1 %A A207762 _R. H. Hardin_ Feb 19 2012