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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.

A208821 Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero.

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%I A208821 #6 Mar 12 2017 23:17:39
%S A208821 1,5,13,75,415,2821,19657,144871,1090645,8392423,65527045,518173267,
%T A208821 4139803293,33366946637
%N A208821 Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero.
%C A208821 Column 4 of A208825.
%e A208821 All solutions for n=3:
%e A208821 .-2...-1....0...-4...-2...-3...-3...-3...-1...-4...-2...-2...-4
%e A208821 .-1....0....0....1....0....0...-1....1...-1....0...-2....1....2
%e A208821 ..3....1....0....3....2....3....4....2....2....4....4....1....2
%K A208821 nonn
%O A208821 1,2
%A A208821 _R. H. Hardin_, Mar 01 2012

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