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 | 2 |
| 1 | 13 |
| 2 | 21 |
| 3 | 198 |
| 4 | 595 |
| 5 | 793 |
| 6 | 1774 |
| 7 | 85505 |
| 8 | 1125339 |
| 9 | 31105498 |
| 10 | 52395920 |
| 11 | 58911095 |
| 12 | 70815266 |
| 13 | 137411174 |
| 14 | 285246559 |
| 15 | 641084601 |
| 16 | 1269499901 |
| 17 | 60923201300 |
| 18 | 181605462455 |
| 19 | 292802733746 |
| 20 | 980702252022 |
| 21 | 2825619545276 |
| 22 | 6954435355458 |