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 | 4 |
| 2 | 8 |
| 3 | 39 |
| 4 | 126 |
| 5 | 482 |
| 6 | 1712 |
| 7 | 6277 |
| 8 | 22700 |
| 9 | 82580 |
| 10 | 299648 |
| 11 | 1088499 |
| 12 | 3952186 |
| 13 | 14352786 |
| 14 | 52119040 |
| 15 | 189266297 |
| 16 | 687294648 |
| 17 | 2495834292 |
| 18 | 9063317432 |
| 19 | 32912374319 |
| 20 | 119517358582 |
| 21 | 434013128786 |
| 22 | 1576067091632 |
| 23 | 5723300581661 |
| 24 | 20783486354532 |