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 A224277 #9 Jul 23 2025 05:03:57 %S A224277 130,4580,84132,1334973,21348990,356222482,6172817040,109166159263, %T A224277 1947747629183,34864494529806,624634228911233,11192898789327524, %U A224277 200562963738597382,3593689853465024489,64389966977277732381 %N A224277 Number of nX4 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. %C A224277 Column 4 of A224281 %H A224277 R. H. Hardin, <a href="/A224277/b224277.txt">Table of n, a(n) for n = 1..210</a> %H A224277 R. H. Hardin, <a href="/A224277/a224277.txt">Empirical recurrence of order 52</a> %F A224277 Empirical recurrence of order 52 (see link above) %e A224277 Some solutions for n=3 %e A224277 ..0..0..1..2....1..1..2..1....3..1..1..1....0..0..0..0....1..2..2..1 %e A224277 ..1..1..2..1....1..2..3..3....3..1..1..1....1..1..2..2....2..3..2..1 %e A224277 ..1..2..1..0....3..3..3..0....2..1..1..1....2..2..2..1....3..3..3..0 %K A224277 nonn %O A224277 1,1 %A A224277 _R. H. Hardin_ Apr 02 2013