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 A209029 #10 Mar 13 2017 05:19:17 %S A209029 1,3,7,38,187,1237,8235,58524,422504,3117158,23290361,176103500, %T A209029 1344136056,10344670554,80181862705,625395356182,4904914026691, %U A209029 38658468142298,306034794302017,2432316965565820,19401236375176220,155259190622702818 %N A209029 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first differences in -5..5. %H A209029 Andrew Howroyd, <a href="/A209029/b209029.txt">Table of n, a(n) for n = 1..50</a> %e A209029 Some solutions for n=6: %e A209029 .-4...-3...-2...-3...-3...-3...-3...-3...-3...-3...-3...-3...-2...-2...-2...-3 %e A209029 .-1....0...-1....0...-2....1....0...-2....1...-2...-2...-3....0....1....0...-2 %e A209029 ..0....1....0....0....1....2....3....2...-3....2....2...-2....1...-1....1....1 %e A209029 ..0....0....3....0....4...-2....0...-1....1....2....1....1....2....1....1....1 %e A209029 ..4....2...-1....1...-1....0...-2....2....2....3....0....5...-2....0...-2....3 %e A209029 ..1....0....1....2....1....2....2....2....2...-2....2....2....1....1....2....0 %Y A209029 Column 5 of A209032. %K A209029 nonn %O A209029 1,2 %A A209029 _R. H. Hardin_, Mar 04 2012 %E A209029 a(15)-a(22) from _Andrew Howroyd_, Mar 12 2017