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.

A117857 Number of palindromes of length n (in base 5).

Table of values

n a(n)
1 4
2 4
3 20
4 20
5 100
6 100
7 500
8 500
9 2500
10 2500
11 12500
12 12500
13 62500
14 62500
15 312500
16 312500
17 1562500
18 1562500
19 7812500
20 7812500
21 39062500
22 39062500
23 195312500
24 195312500
25 976562500
26 976562500
27 4882812500
28 4882812500
29 24414062500
30 24414062500
31 122070312500

List of values

[4, 4, 20, 20, 100, 100, 500, 500, 2500, 2500, 12500, 12500, 62500, 62500, 312500, 312500, 1562500, 1562500, 7812500, 7812500, 39062500, 39062500, 195312500, 195312500, 976562500, 976562500, 4882812500, 4882812500, 24414062500, 24414062500, 122070312500]

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

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