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 A223878 #8 Jul 23 2025 04:37:43 %S A223878 256,65536,3863372,88682677,1271992512,13394424591,112751480926, %T A223878 798519332969,4918189868664,26945689043408,133456233695247, %U A223878 604775893442790,2531399109074463,9862376758221364,35997221510544568 %N A223878 Number of 4Xn 0..3 arrays with rows, diagonals and antidiagonals unimodal. %C A223878 Row 4 of A223876 %H A223878 R. H. Hardin, <a href="/A223878/b223878.txt">Table of n, a(n) for n = 1..177</a> %H A223878 R. H. Hardin, <a href="/A223878/a223878.txt">Empirical polynomial of degree 24</a> %F A223878 Empirical polynomial of degree 24 (see link above) %e A223878 Some solutions for n=3 %e A223878 ..2..0..0....0..0..2....0..0..0....0..0..0....0..0..2....0..0..0....0..0..0 %e A223878 ..2..2..0....0..2..1....2..2..1....1..2..3....3..2..0....0..2..1....0..0..0 %e A223878 ..0..3..2....3..3..0....0..2..1....2..3..0....1..2..1....1..3..2....1..0..0 %e A223878 ..1..3..0....1..2..3....3..3..0....0..3..0....2..3..1....0..0..1....0..1..0 %K A223878 nonn %O A223878 1,1 %A A223878 _R. H. Hardin_ Mar 28 2013