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 A202074 #9 Jul 22 2025 16:28:16 %S A202074 30,364,1128,0,35604,462436,1516410,0,50331332,670671976,2244207954,0, %T A202074 76189204224,1028085663460,3477020782410,0,119558435601108, %U A202074 1625407357115064,5533419347709582,0,191835254536494250 %N A202074 Number of arrays of n+2 integers in -6..6 with sum zero and the sum of every adjacent pair being odd. %C A202074 Column 6 of A202076 %H A202074 R. H. Hardin, <a href="/A202074/b202074.txt">Table of n, a(n) for n = 1..210</a> %e A202074 Some solutions for n=3 %e A202074 ..2....6....4...-6...-4....2....2...-4...-6...-4....4....0...-2...-4...-2....4 %e A202074 ..1...-1...-3...-1....3....1...-1...-1....1....5...-1...-5....3....1....3...-5 %e A202074 .-6....2....2....0...-2...-4...-4....2....6...-4...-2....0...-6...-2....0...-4 %e A202074 .-3...-5....3....3...-1...-3....5...-3...-5....1....3....3....3...-1....5....3 %e A202074 ..6...-2...-6....4....4....4...-2....6....4....2...-4....2....2....6...-6....2 %K A202074 nonn %O A202074 1,1 %A A202074 _R. H. Hardin_ Dec 10 2011