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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.

A209031 Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and first differences in -7..7.

Table of values

n a(n)
1 1
2 4
3 12
4 88
5 625
6 5648
7 52208
8 505857
9 4992048
10 50169067
11 510807173
12 5260218485
13 54684221779
14 573168585795
15 6050541798221
16 64271927631233
17 686512535921878
18 7369066749454264
19 79449368494683376
20 859987831858141180
21 9342319735394175920
22 101820772577694786504

List of values

[1, 4, 12, 88, 625, 5648, 52208, 505857, 4992048, 50169067, 510807173, 5260218485, 54684221779, 573168585795, 6050541798221, 64271927631233, 686512535921878, 7369066749454264, 79449368494683376, 859987831858141180, 9342319735394175920, 101820772577694786504]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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