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 A201492 #7 Mar 25 2022 18:54:34 %S A201492 8,1454,301432,50432052,6697376240,732383803600,68110029402413, %T A201492 5516712973977104,396137884984421823,25563298281912009949, %U A201492 1498543207391775400633,80501743778622446236710 %N A201492 Number of n X 4 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing. %C A201492 Column 4 of A201496. %H A201492 R. H. Hardin, <a href="/A201492/b201492.txt">Table of n, a(n) for n = 1..27</a> %e A201492 Some solutions for n=2 %e A201492 .-2..0..0..2...-2.-1..2..2...-2.-1..0..2...-1.-1..1..1...-2.-1..0..1 %e A201492 .-1..0..0..1...-2..1.-2..2....1..1..1.-2....1..1.-2..0....0..1.-1..2 %Y A201492 Cf. A201496. %K A201492 nonn %O A201492 1,1 %A A201492 _R. H. Hardin_, Dec 02 2011