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 A233298 #5 May 23 2023 12:05:17
%S A233298 13,42,141,502,1739,5964,20185,67609,224165,737347,2407911,7814616,
%T A233298 25223004,81015137,259099567,825507109,2621224089,8298060296,
%U A233298 26197890927,82506334112,259260476024
%N A233298 Number of (n+1) X (2+1) 0..1 arrays x(i,j) with row sums Sum_{j=1..2+1} x(i,j) nondecreasing, and column sums Sum_{i=1..n+1} i^2*x(i,j) nondecreasing.
%C A233298 Column 2 of A233301.
%e A233298 Some solutions for n=5
%e A233298 ..0..1..0....1..1..0....0..0..0....0..0..0....0..0..1....0..0..0....1..0..0
%e A233298 ..1..1..0....1..1..0....0..0..0....0..1..0....0..1..0....0..0..0....0..0..1
%e A233298 ..0..1..1....1..0..1....1..0..0....0..0..1....0..1..0....0..0..0....1..1..0
%e A233298 ..0..1..1....0..1..1....0..1..0....0..0..1....0..0..1....0..0..0....1..1..0
%e A233298 ..1..0..1....0..1..1....0..0..1....0..0..1....1..0..0....0..0..1....1..0..1
%e A233298 ..0..1..1....1..1..1....1..1..1....1..1..1....0..1..1....0..1..1....0..1..1
%Y A233298 Cf. A233301.
%K A233298 nonn
%O A233298 1,1
%A A233298 _R. H. Hardin_, Dec 07 2013