cp's OEIS Frontend

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.

A209030 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first differences in -6..6.

Original entry on oeis.org

1, 4, 10, 60, 358, 2798, 22249, 186765, 1596162, 13907330, 122758794, 1096122478, 9880366438, 89796245827, 821927851286, 7570508171686, 70115797179348, 652594351781036, 6100765243003922, 57259681174637899, 539353919732122101, 5097036850039818860
Offset: 1

Views

Author

R. H. Hardin, Mar 04 2012

Keywords

Examples

			Some solutions for n=6:
  -3  -6  -4  -4  -2  -3  -3  -3  -4  -6  -3  -3  -2  -4  -5  -5
  -1  -1  -3  -3   0  -2   1   0   1  -4  -2  -1  -1  -3   1  -5
   4  -1   0   2   1   2   3  -2  -3   2   2   4   2   2  -4   0
  -2   3   5   3  -1  -1  -1   1   0   3   2  -1   0   3   2   5
   0   5   4   4   0   1  -2   2   5   5   2  -1   0   0   5   4
   2   0  -2  -2   2   3   2   2   1   0  -1   2   1   2   1   1
		

Crossrefs

Column 6 of A209032.

Extensions

a(14)-a(22) from Andrew Howroyd, Mar 12 2017