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.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 27 |
| 3 | 9 |
| 4 | 2166 |
| 5 | 45 |
| 6 | 371643 |
| 7 | 261 |
| 8 | 77055612 |
| 9 | 1557 |
| 10 | 16530541953 |
| 11 | 9333 |
| 12 | 3566560502166 |
| 13 | 55989 |
| 14 | 770233227440127 |
| 15 | 335925 |
| 16 | 166365249148401792 |
| 17 | 2015541 |
| 18 | 35934710960120160093 |
| 19 | 12093237 |
| 20 | 7761891045770533947786 |
| 21 | 72559413 |
| 22 | 1676568233248144889168571 |
| 23 | 435356469 |