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 A223872 #6 Jul 23 2025 04:37:02 %S A223872 130,16900,1336985,88682677,5941888105,411716468431,28928809433978, %T A223872 2033941972287214,142745781634483746,10010372252279889400, %U A223872 701993937730379495973,49234252523359799838831,3453202734892638263202801 %N A223872 Number of nX4 0..3 arrays with rows, diagonals and antidiagonals unimodal. %C A223872 Column 4 of A223876 %H A223872 R. H. Hardin, <a href="/A223872/b223872.txt">Table of n, a(n) for n = 1..210</a> %e A223872 Some solutions for n=3 %e A223872 ..0..2..3..2....0..0..3..1....0..0..1..1....0..0..3..2....0..2..3..1 %e A223872 ..0..2..2..1....1..2..1..1....2..2..2..3....2..2..2..1....1..2..2..3 %e A223872 ..0..1..1..3....1..3..2..1....0..1..2..2....1..1..1..3....0..3..3..3 %K A223872 nonn %O A223872 1,1 %A A223872 _R. H. Hardin_ Mar 28 2013