cp's OEIS Frontend

A229777 Number of 5X5 0..n arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.

%I A229777 #6 Jul 23 2025 05:47:05
%S A229777 252,2179956,3062815568,843211336888,81937334158292,3896490956821414,
%T A229777 110102810429666544,2093314279759590565,29136130649614970102,
%U A229777 315228320642171324718,2770642691605055402356,20456013945849864263232
%N A229777 Number of 5X5 0..n arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.
%C A229777 Row 5 of A229774
%H A229777 R. H. Hardin, <a href="/A229777/b229777.txt">Table of n, a(n) for n = 1..17</a>
%e A229777 Some solutions for n=1
%e A229777 ..1..0..0..0..0....0..0..0..0..0....1..1..0..0..0....0..0..0..0..0
%e A229777 ..1..0..0..0..0....1..1..0..0..0....1..1..0..0..0....0..0..0..0..0
%e A229777 ..1..0..0..0..0....1..1..1..0..0....1..1..0..0..0....1..1..1..0..0
%e A229777 ..1..1..0..0..0....1..1..1..0..0....1..1..0..0..0....1..1..1..0..0
%e A229777 ..1..1..1..1..0....1..1..1..1..0....1..1..1..1..0....1..1..1..1..0
%K A229777 nonn
%O A229777 1,1
%A A229777 _R. H. Hardin_, Sep 29 2013