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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 38 |
| 4 | 277 |
| 5 | 2522 |
| 6 | 27547 |
| 7 | 351038 |
| 8 | 5112457 |
| 9 | 83764082 |
| 10 | 1524907087 |
| 11 | 30536665238 |
| 12 | 667096092637 |
| 13 | 15787642820042 |
| 14 | 402374890155427 |
| 15 | 10987722264846638 |
| 16 | 320046586135452817 |
| 17 | 9904844539648850402 |
| 18 | 324568009210656076567 |
| 19 | 11226512280285374623238 |