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 | 21 |
| 2 | 441 |
| 3 | 3223 |
| 4 | 25689 |
| 5 | 243981 |
| 6 | 2405923 |
| 7 | 24609889 |
| 8 | 254583643 |
| 9 | 2656816215 |
| 10 | 27824719899 |
| 11 | 292111495571 |
| 12 | 3070203057091 |
| 13 | 32292544414703 |
| 14 | 339784841081719 |
| 15 | 3576079932320067 |
| 16 | 37641488144050995 |
| 17 | 396241624155306475 |