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 | 8 |
| 3 | 46 |
| 4 | 215 |
| 5 | 6904 |
| 6 | 86723 |
| 7 | 441262 |
| 8 | 2517902 |
| 9 | 61277761 |
| 10 | 827712431 |
| 11 | 2954399858 |
| 12 | 4281473701 |
| 13 | 63767491786 |
| 14 | 888318557945 |
| 15 | 4011156408934 |
| 16 | 23888027348153 |
| 17 | 656017679474182 |
| 18 | 8425863189971522 |
| 19 | 48918490589341081 |
| 20 | 278558570881511441 |