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A223992 Number of 7Xn 0..3 arrays with rows unimodal and columns nondecreasing.

%I A223992 #8 Jul 23 2025 04:47:10
%S A223992 120,14400,922768,37395816,1067023886,22985966340,392525216516,
%T A223992 5508176253088,65292420643662,668174455857788,6007915697153117,
%U A223992 48154648894009693,348228115672689236,2295175317417878268
%N A223992 Number of 7Xn 0..3 arrays with rows unimodal and columns nondecreasing.
%C A223992 Row 7 of A223987
%H A223992 R. H. Hardin, <a href="/A223992/b223992.txt">Table of n, a(n) for n = 1..210</a>
%H A223992 R. H. Hardin, <a href="/A223992/a223992.txt">Empirical polynomial of degree 42</a>
%F A223992 Empirical polynomial of degree 42 (see link above)
%e A223992 Some solutions for n=3
%e A223992 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
%e A223992 ..0..0..0....0..0..0....0..0..2....0..0..0....0..0..0....0..0..1....0..2..0
%e A223992 ..0..2..0....0..2..1....1..2..3....0..0..1....0..2..0....0..0..2....0..2..1
%e A223992 ..1..2..1....0..2..1....1..2..3....0..2..1....0..2..0....1..1..2....0..2..1
%e A223992 ..1..2..1....2..2..1....1..3..3....2..3..1....2..2..1....1..2..2....1..3..1
%e A223992 ..3..2..1....2..2..2....1..3..3....3..3..1....3..3..1....3..2..2....2..3..2
%e A223992 ..3..2..1....2..2..3....1..3..3....3..3..1....3..3..2....3..2..2....2..3..2
%K A223992 nonn
%O A223992 1,1
%A A223992 _R. H. Hardin_ Mar 30 2013