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 A209595 #7 Jul 22 2025 21:50:49 %S A209595 9216,1476225,51380224,791015625,7316407296,47738317081,241591910400, %T A209595 1007680691889,3610000000000,11438404249041,32754285674496, %U A209595 86161557405625,210866643477504,484962978515625,1056630674292736 %N A209595 Number of 4X4 0..n arrays with every element equal to a diagonal or antidiagonal reflection. %C A209595 Row 4 of A209593 %H A209595 R. H. Hardin, <a href="/A209595/b209595.txt">Table of n, a(n) for n = 1..50</a> %F A209595 a(n) = (n+1) ^ 8 * ((n+1)*(2*n+1)) ^ 2 %e A209595 Some solutions for n=3 %e A209595 ..0..0..2..3....0..0..2..0....0..0..2..2....0..0..0..0....0..0..3..3 %e A209595 ..0..2..1..2....0..2..2..2....0..2..3..2....0..0..3..0....0..1..2..3 %e A209595 ..2..0..0..0....3..2..0..0....0..3..1..0....2..2..3..0....1..3..2..0 %e A209595 ..0..2..0..0....3..3..0..0....3..0..0..0....0..2..0..0....2..1..0..0 %K A209595 nonn %O A209595 1,1 %A A209595 _R. H. Hardin_ Mar 10 2012