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 | 31 |
| 2 | 205 |
| 3 | 1379 |
| 4 | 9333 |
| 5 | 63399 |
| 6 | 431717 |
| 7 | 2944947 |
| 8 | 20115561 |
| 9 | 137543107 |
| 10 | 941258689 |
| 11 | 6445801999 |
| 12 | 44166431335 |
| 13 | 302771722951 |
| 14 | 2076414065529 |
| 15 | 14244985903467 |
| 16 | 97754711626643 |
| 17 | 671000257052461 |
| 18 | 4606822746884183 |
| 19 | 31634499742407797 |