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.

A198800 Number of closed paths of length n whose steps are 20th roots of unity, U_20(n).

Table of values

n a(n)
0 1
1 0
2 20
3 0
4 1140
5 480
6 102800
7 151200
8 12310900
9 38707200
10 1812247920
11 9574488000
12 313983978000
13 2391608419200
14 62051403928800
15 611744666332800
16 13627749414064500
17 160896284989440000
18 3253345101771050000
19 43527416858084016000
20 829176006298475046640

List of values

[1, 0, 20, 0, 1140, 480, 102800, 151200, 12310900, 38707200, 1812247920, 9574488000, 313983978000, 2391608419200, 62051403928800, 611744666332800, 13627749414064500, 160896284989440000, 3253345101771050000, 43527416858084016000, 829176006298475046640]

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

Content is available under The OEIS End-User License Agreement.