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 | 5 |
| 2 | 11 |
| 3 | 234 |
| 4 | 1320 |
| 5 | 9475 |
| 6 | 117469 |
| 7 | 266286 |
| 8 | 9184560 |
| 9 | 3302155 |
| 10 | 520632300 |
| 11 | 1387108806 |
| 12 | 23922442439 |
| 13 | 154165737965 |
| 14 | 933420304380 |
| 15 | 13338456688674 |
| 16 | 22995028210081 |
| 17 | 1026964091673115 |
| 18 | 713853567388260 |
| 19 | 54078566783400895 |
| 20 | 171226928056302601 |
| 21 | 2435077776719657394 |