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 A223979 #8 Jul 23 2025 04:45:01 %S A223979 729,531441,70779056,2809740785,55803232969,715985189481, %T A223979 6766457318128,50783406166411,317861952928894,1716630787916775, %U A223979 8199247742192030,35287118527617297,138825002272586304,505004840634444527 %N A223979 Number of 6Xn 0..2 arrays with rows and antidiagonals unimodal. %C A223979 Row 6 of A223975 %H A223979 R. H. Hardin, <a href="/A223979/b223979.txt">Table of n, a(n) for n = 1..144</a> %H A223979 R. H. Hardin, <a href="/A223979/a223979.txt">Empirical polynomial of degree 24</a> %F A223979 Empirical polynomial of degree 24 (see link above) %e A223979 Some solutions for n=3 %e A223979 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A223979 ..0..0..1....0..0..0....0..0..1....0..0..1....0..0..1....0..0..1....0..0..1 %e A223979 ..0..1..1....1..1..1....1..1..0....1..1..0....1..1..0....0..1..0....1..1..1 %e A223979 ..0..2..1....0..1..0....0..2..1....0..0..1....1..2..0....0..0..1....0..1..1 %e A223979 ..0..1..0....0..2..0....1..1..2....0..1..1....1..2..2....0..1..0....0..1..2 %e A223979 ..1..2..1....1..1..2....0..0..1....1..2..1....0..2..0....1..1..1....0..2..0 %K A223979 nonn %O A223979 1,1 %A A223979 _R. H. Hardin_ Mar 30 2013