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 | 8 |
| 3 | 20 |
| 4 | 146139 |
| 5 | 584835 |
| 6 | 44814015 |
| 7 | 1436395095 |
| 8 | 9988999095 |
| 9 | 25997557299 |
| 10 | 193861767939 |
| 11 | 2105722150095 |
| 12 | 3921293253003 |
| 13 | 8234992646643 |