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 A189178 #11 Aug 28 2024 09:25:59 %S A189178 0,9,192,251720,1339732352,108943637068673,76260881288534294528, %T A189178 594579828469677562655346609,46342255378179654331792920815382272, %U A189178 37825739518339601867409254032413815052514057 %N A189178 Number of n X n array permutations with each element making a single king move. %e A189178 Some solutions for 3 X 3: %e A189178 ..4..0..5....4..0..1....1..2..4....3..0..5....1..4..5....4..2..1....3..0..1 %e A189178 ..1..8..2....6..2..8....0..3..8....1..2..8....0..6..2....0..6..8....6..8..2 %e A189178 ..3..6..7....3..5..7....7..6..5....4..6..7....3..8..7....3..5..7....4..5..7 %Y A189178 Diagonal of A189186. %K A189178 nonn,more %O A189178 1,2 %A A189178 _R. H. Hardin_, Apr 18 2011 %E A189178 a(9)-a(10) from _Pontus von Brömssen_, Aug 28 2024