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 A233303 #8 Jul 23 2025 07:59:08
%S A233303 31,141,567,1986,6292,18205,48913,123084,292784,662512,1434508,
%T A233303 2985639,5997455,11666253,22040149,40541549,72770415,127706638,
%U A233303 219494579,370035418,612722058,997726253,1599424522,2526675993,3936943281
%N A233303 Number of (3+1)X(n+1) 0..1 arrays x(i,j) with row sums sum{x(i,j), j=1..n+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..3+1} nondecreasing.
%C A233303 Row 3 of A233301, row 4 of A267245.
%H A233303 R. H. Hardin, <a href="/A233303/b233303.txt">Table of n, a(n) for n = 1..66</a>
%e A233303 Some solutions for n=5
%e A233303 ..0..0..1..0..0..0....0..1..0..0..0..1....0..0..0..0..0..1....1..1..1..0..0..0
%e A233303 ..1..0..0..1..0..0....0..0..0..1..1..1....1..0..1..0..0..1....0..0..0..1..1..1
%e A233303 ..1..0..0..0..1..1....0..0..0..1..1..1....0..1..1..0..0..1....1..0..1..1..1..1
%e A233303 ..0..1..1..1..1..1....0..0..1..1..1..1....0..0..0..1..1..1....0..1..1..1..1..1
%K A233303 nonn
%O A233303 1,1
%A A233303 _R. H. Hardin_, Dec 07 2013