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 A224387 #8 Jul 23 2025 05:08:34 %S A224387 35,1225,27790,497958,8573507,152271025,2780848289,51325449985, %T A224387 949582166068,17572045403455,325249748226217,6022221071267123, %U A224387 111533443784218247,2065901802649317374,38268294526698715055 %N A224387 Number of nX4 0..3 arrays with diagonals and antidiagonals unimodal and rows nondecreasing. %C A224387 Column 4 of A224391 %H A224387 R. H. Hardin, <a href="/A224387/b224387.txt">Table of n, a(n) for n = 1..210</a> %H A224387 R. H. Hardin, <a href="/A224387/a224387.txt">Empirical recurrence of order 47</a> %F A224387 Empirical recurrence of order 47 (see link above) %e A224387 Some solutions for n=3 %e A224387 ..2..2..3..3....1..1..3..3....0..0..1..3....0..0..0..3....2..2..3..3 %e A224387 ..0..2..2..2....2..2..3..3....1..2..3..3....0..0..0..2....1..1..2..3 %e A224387 ..1..1..2..2....0..1..2..2....2..2..2..2....0..0..1..1....0..1..1..3 %K A224387 nonn %O A224387 1,1 %A A224387 _R. H. Hardin_ Apr 05 2013