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 A223794 #5 Jul 23 2025 04:31:37 %S A223794 2187,4782969,862007289,27088106846,377163884938,3219192158949, %T A223794 20229461153969,106414755617907,508945269335431 %N A223794 Number of 7Xn 0..2 arrays with rows, diagonals and antidiagonals unimodal. %C A223794 Row 7 of A223789 %e A223794 Some solutions for n=3 %e A223794 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A223794 ..0..0..1....0..0..1....0..0..1....0..0..0....0..0..1....0..0..0....0..0..0 %e A223794 ..0..1..1....0..1..1....0..1..1....0..0..1....0..0..0....0..1..0....0..0..0 %e A223794 ..0..0..0....0..0..2....0..2..2....0..2..1....0..2..0....0..0..0....0..2..1 %e A223794 ..0..0..1....0..0..0....0..0..0....0..1..0....0..0..1....0..0..2....0..0..0 %e A223794 ..0..2..0....0..2..0....0..2..2....0..2..2....2..1..0....1..1..0....0..2..0 %e A223794 ..0..0..2....1..1..0....2..0..0....0..2..1....1..1..0....0..2..0....0..1..1 %K A223794 nonn %O A223794 1,1 %A A223794 _R. H. Hardin_ Mar 27 2013