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 | 48 |
| 3 | 392 |
| 4 | 4678 |
| 5 | 43676 |
| 6 | 406396 |
| 7 | 3568906 |
| 8 | 30554390 |
| 9 | 254834078 |
| 10 | 2085479610 |
| 11 | 16791859330 |
| 12 | 133416458104 |
| 13 | 1048095087616 |
| 14 | 8154539310958 |
| 15 | 62918331433308 |
| 16 | 481954854686434 |
| 17 | 3668399080453520 |
| 18 | 27766093432542984 |
| 19 | 209120844634276158 |
| 20 | 1568050593805721822 |