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 A208822 #8 Apr 21 2021 13:12:31 %S A208822 1,6,18,131,905,7582,65134,587682,5416897,50959134,486441796, %T A208822 4701644087,45911470685 %N A208822 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero. %C A208822 Column 5 of A208825. %e A208822 Some solutions for n=3: %e A208822 .-2...-2...-2...-3...-5...-3...-2...-5...-4...-4....0...-4...-3...-1...-4...-5 %e A208822 ..0...-2...-1....0....2...-1....1....1...-1....0....0....2...-2...-1....1....0 %e A208822 ..2....4....3....3....3....4....1....4....5....4....0....2....5....2....3....5 %Y A208822 Cf. A208825. %K A208822 nonn %O A208822 1,2 %A A208822 _R. H. Hardin_, Mar 01 2012