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 A223573 #8 Jul 23 2025 04:14:39
%S A223573 243,59049,7762392,746600976,64207683936,5521860818496,
%T A223573 474880030390656,40839682613596416,3512212704769291776,
%U A223573 302050292610159092736,25976325164473681975296,2233963964144736649875456
%N A223573 Number of nX5 0..2 arrays with antidiagonals unimodal.
%C A223573 Column 5 of A223576
%H A223573 R. H. Hardin, <a href="/A223573/b223573.txt">Table of n, a(n) for n = 1..210</a>
%F A223573 Let U(z) = (z^4+6*z^3+23*z^2+18*z+24)/24
%F A223573 a(n) = U(min(n,5))^(max(n,5)-min(n,5)+1) * product{ U(i)^2 , i=1..(min(n,5)-1) }
%F A223573 a(n) = 86*a(n-1) for n>4
%e A223573 Some solutions for n=3
%e A223573 ..0..0..1..2..1....0..0..0..1..1....0..0..0..1..2....0..0..2..1..0
%e A223573 ..0..2..1..1..1....0..1..2..0..0....0..0..0..2..2....0..2..1..0..0
%e A223573 ..0..0..1..0..2....0..2..0..2..1....0..0..1..2..2....0..0..2..1..1
%K A223573 nonn
%O A223573 1,1
%A A223573 _R. H. Hardin_ Mar 22 2013