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 | 11 |
| 3 | 33 |
| 4 | 114 |
| 5 | 397 |
| 6 | 1524 |
| 7 | 5873 |
| 8 | 23492 |
| 9 | 95033 |
| 10 | 390262 |
| 11 | 1617513 |
| 12 | 6764338 |
| 13 | 28478813 |
| 14 | 120631428 |
| 15 | 513569941 |
| 16 | 2196269672 |
| 17 | 9429031893 |
| 18 | 40621573968 |
| 19 | 175544747673 |
| 20 | 760719000950 |
| 21 | 3304818106413 |
| 22 | 14389871196680 |