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 A207082 #8 Jul 22 2025 20:00:25 %S A207082 2,16,241,10621,1128580,289951889,189659424011,309962689144609, %T A207082 1271408331944150733,13184774275002026128508, %U A207082 345132526969505296701072063,22839657048171631176301571722877,3824685810041409132386645720304598864 %N A207082 Number of n X n 0..1 arrays avoiding 0 0 0 horizontally and 0 0 1 vertically. %C A207082 Diagonal of A207088 %e A207082 Some solutions for n=4 %e A207082 ..0..1..1..1....1..1..0..1....0..0..1..0....1..1..0..1....1..0..1..1 %e A207082 ..0..0..1..0....1..1..0..1....1..1..1..0....1..0..0..1....0..0..1..1 %e A207082 ..0..1..1..1....0..1..0..0....0..1..1..0....0..1..0..0....0..0..1..1 %e A207082 ..0..0..1..1....0..1..0..0....1..1..0..0....1..1..0..1....0..0..1..1 %K A207082 nonn %O A207082 1,1 %A A207082 _R. H. Hardin_ Feb 15 2012