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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.

A208817 Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.

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%I A208817 #7 Mar 12 2017 23:15:33
%S A208817 1,3,8,75,905,17339,417204,12322101,427919519,17112239947,774546254686
%N A208817 Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.
%C A208817 Diagonal of A208825.
%e A208817 All solutions for n=3:
%e A208817 .-2....0...-3...-3...-2...-1...-2...-1
%e A208817 .-1....0....0....1....0...-1....1....0
%e A208817 ..3....0....3....2....2....2....1....1
%K A208817 nonn
%O A208817 1,2
%A A208817 _R. H. Hardin_, Mar 01 2012

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