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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.

A000159 Coefficients of ménage hit polynomials.

Table of values

n a(n)
3 2
4 8
5 20
6 152
7 994
8 7888
9 70152
10 695760
11 7603266
12 90758872
13 1174753372
14 16386899368
15 245046377410
16 3910358788256
17 66323124297872
18 1191406991067168
19 22596344660865282
20 451208920617687720
21 9461897733571886372
22 207894669895136763704
23 4776019866458134139042

List of values

[2, 8, 20, 152, 994, 7888, 70152, 695760, 7603266, 90758872, 1174753372, 16386899368, 245046377410, 3910358788256, 66323124297872, 1191406991067168, 22596344660865282, 451208920617687720, 9461897733571886372, 207894669895136763704, 4776019866458134139042]

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

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