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.

A198769 a(n) = (9*5^n-1)/4.

Table of values

n a(n)
0 2
1 11
2 56
3 281
4 1406
5 7031
6 35156
7 175781
8 878906
9 4394531
10 21972656
11 109863281
12 549316406
13 2746582031
14 13732910156
15 68664550781
16 343322753906
17 1716613769531
18 8583068847656
19 42915344238281
20 214576721191406
21 1072883605957031
22 5364418029785156
23 26822090148925781

List of values

[2, 11, 56, 281, 1406, 7031, 35156, 175781, 878906, 4394531, 21972656, 109863281, 549316406, 2746582031, 13732910156, 68664550781, 343322753906, 1716613769531, 8583068847656, 42915344238281, 214576721191406, 1072883605957031, 5364418029785156, 26822090148925781]

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

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