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 | 1 |
| 2 | 16 |
| 3 | 206 |
| 4 | 2371 |
| 5 | 25761 |
| 6 | 272376 |
| 7 | 2848716 |
| 8 | 29701906 |
| 9 | 309654696 |
| 10 | 3230358586 |
| 11 | 33718475076 |
| 12 | 352065356916 |
| 13 | 3676515354356 |
| 14 | 38394136371396 |
| 15 | 400952138922036 |
| 16 | 4187122750092776 |
| 17 | 43725550173817616 |
| 18 | 456617901788403056 |