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A223661 Number of nX3 0..3 arrays with row sums unimodal and column sums inverted unimodal.

%I A223661 #6 Jul 23 2025 04:21:38
%S A223661 50,3060,141046,5285887,169756788,4836834467,125226945708,
%T A223661 2997363216275,67192414310968,1424909830742272,28811928773038893,
%U A223661 559031955620162864,10462533894185251783,189688734342719058204,3343610975591843927435
%N A223661 Number of nX3 0..3 arrays with row sums unimodal and column sums inverted unimodal.
%C A223661 Column 3 of A223663
%H A223661 R. H. Hardin, <a href="/A223661/b223661.txt">Table of n, a(n) for n = 1..24</a>
%e A223661 Some solutions for n=3
%e A223661 ..0..1..2....0..0..1....1..2..2....1..2..0....1..0..2....0..2..0....2..3..0
%e A223661 ..2..1..3....0..0..3....1..2..3....2..1..0....3..1..2....3..0..3....3..2..0
%e A223661 ..3..2..1....3..2..1....2..0..0....1..1..1....0..1..2....2..1..0....1..0..3
%K A223661 nonn
%O A223661 1,1
%A A223661 _R. H. Hardin_ Mar 25 2013