cp's OEIS Frontend

A223990 Number of 5Xn 0..3 arrays with rows unimodal and columns nondecreasing.

%I A223990 #8 Jul 23 2025 04:46:55
%S A223990 56,3136,99634,2086196,31831914,378122264,3661410444,29889154034,
%T A223990 211009204916,1314178222276,7336228725354,37185201981670,
%U A223990 172974779780114,745060738789758,2994209711354545,11299608627412727,40267814207071512
%N A223990 Number of 5Xn 0..3 arrays with rows unimodal and columns nondecreasing.
%C A223990 Row 5 of A223987
%H A223990 R. H. Hardin, <a href="/A223990/b223990.txt">Table of n, a(n) for n = 1..210</a>
%H A223990 R. H. Hardin, <a href="/A223990/a223990.txt">Empirical polynomial of degree 30</a>
%F A223990 Empirical polynomial of degree 30 (see link above)
%e A223990 Some solutions for n=3
%e A223990 ..0..2..0....0..2..0....1..1..0....0..2..0....0..0..0....1..3..0....1..1..0
%e A223990 ..0..3..0....0..2..0....1..2..1....0..2..0....0..2..0....1..3..0....1..2..0
%e A223990 ..0..3..0....0..3..2....2..3..1....0..2..2....1..3..1....1..3..0....3..2..0
%e A223990 ..3..3..2....0..3..3....2..3..1....0..2..2....1..3..1....1..3..3....3..3..3
%e A223990 ..3..3..2....0..3..3....2..3..1....0..3..2....1..3..1....3..3..3....3..3..3
%K A223990 nonn
%O A223990 1,1
%A A223990 _R. H. Hardin_ Mar 30 2013