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 A202073 #7 May 04 2023 12:19:16 %S A202073 24,220,504,0,15010,142692,340660,0,10924220,105606040,255768620,0, %T A202073 8472842700,82602700388,201570991218,0,6800283132780,66634056364880, %U A202073 163360889824230,0,5575911122723700,54822111009651480,134826580792851780 %N A202073 Number of arrays of n+2 integers in -5..5 with sum zero and the sum of every adjacent pair being odd. %C A202073 Column 5 of A202076. %H A202073 R. H. Hardin, <a href="/A202073/b202073.txt">Table of n, a(n) for n = 1..210</a> %e A202073 Some solutions for n=3 %e A202073 ..2....2...-4....2....0....4...-2....2...-4....2....4...-2....2....4...-2....4 %e A202073 .-1....5....5....5....3...-3...-3...-3....5....3...-1...-3...-3...-1...-1....3 %e A202073 .-4...-2....2....0....4....2....0....4....0...-2...-4....4....4...-2....4....0 %e A202073 .-1...-1....1...-3...-5...-3....3...-5....3...-1....5....3...-1...-1...-1...-3 %e A202073 ..4...-4...-4...-4...-2....0....2....2...-4...-2...-4...-2...-2....0....0...-4 %Y A202073 Cf. A202076. %K A202073 nonn %O A202073 1,1 %A A202073 _R. H. Hardin_, Dec 10 2011