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 A223793 #6 Jul 23 2025 04:31:29 %S A223793 729,531441,48302789,1026135371,11150023974,82093381460,478507693443, %T A223793 2431894894768,11344157673659,49637341916982,205245174369997, %U A223793 804275933241975,2993676733618967,10612510462313603,35930784248755558 %N A223793 Number of 6Xn 0..2 arrays with rows, diagonals and antidiagonals unimodal. %C A223793 Row 6 of A223789 %H A223793 R. H. Hardin, <a href="/A223793/b223793.txt">Table of n, a(n) for n = 1..24</a> %e A223793 Some solutions for n=3 %e A223793 ..0..0..0....0..0..1....0..0..0....0..0..0....0..0..1....0..0..0....0..0..0 %e A223793 ..0..0..0....0..1..1....0..1..1....0..0..1....0..1..1....0..1..0....0..1..1 %e A223793 ..0..0..1....0..0..0....0..0..1....0..0..1....0..0..2....0..0..1....0..1..0 %e A223793 ..0..1..2....0..0..1....0..2..0....0..2..1....0..0..2....0..1..0....0..0..2 %e A223793 ..2..1..0....1..1..0....0..0..1....0..0..0....0..1..2....2..2..0....0..0..0 %e A223793 ..0..1..2....1..1..0....2..2..1....0..1..2....0..1..0....0..0..0....0..0..2 %K A223793 nonn %O A223793 1,1 %A A223793 _R. H. Hardin_ Mar 27 2013