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 A249976 #6 Jun 02 2025 10:16:20 %S A249976 6,24,88,384,1606,7138,31380,141272,635686,2890884,13175784,60384934, %T A249976 277442652,1279055676,5909701748,27368939688,126981852654, %U A249976 590182327132,2747109920736,12804571294224,59756343262648,279183944932752 %N A249976 Number of length n+1 0..2*2 arrays with the sum of the absolute values of adjacent differences equal to n*2. %C A249976 Column 2 of A249982 %H A249976 R. H. Hardin, <a href="/A249976/b249976.txt">Table of n, a(n) for n = 1..210</a> %e A249976 Some solutions for n=6 %e A249976 ..0....2....3....1....0....2....3....1....2....3....0....1....4....2....0....0 %e A249976 ..1....0....2....3....4....4....2....2....3....1....3....2....3....0....0....4 %e A249976 ..4....4....2....1....0....2....4....3....1....3....3....4....1....2....4....3 %e A249976 ..4....1....1....1....1....3....0....0....3....1....1....3....4....4....1....2 %e A249976 ..1....1....4....4....2....0....3....1....0....0....4....0....3....0....1....4 %e A249976 ..4....2....0....1....3....2....2....4....0....3....4....4....0....0....4....0 %e A249976 ..2....0....3....3....2....4....1....1....4....1....0....3....2....2....2....0 %K A249976 nonn %O A249976 1,1 %A A249976 _R. H. Hardin_, Nov 10 2014