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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.

A208820 Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero.

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%I A208820 #6 Mar 12 2017 23:17:05
%S A208820 1,4,8,38,155,828,4390,25202,146803,878708,5330524,32785934,203687695,
%T A208820 1276913732,8065359582,51282069040
%N A208820 Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero.
%C A208820 Column 3 of A208825.
%e A208820 All solutions for n=3:
%e A208820 .-2....0...-2...-3...-1...-3...-1...-2
%e A208820 .-1....0....1....1...-1....0....0....0
%e A208820 ..3....0....1....2....2....3....1....2
%K A208820 nonn
%O A208820 1,2
%A A208820 _R. H. Hardin_, Mar 01 2012

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