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 | 3 |
| 1 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 49 |
| 5 | 241 |
| 6 | 1441 |
| 7 | 10081 |
| 8 | 80641 |
| 9 | 725761 |
| 10 | 7257601 |
| 11 | 79833601 |
| 12 | 958003201 |
| 13 | 12454041601 |
| 14 | 174356582401 |
| 15 | 2615348736001 |
| 16 | 41845579776001 |
| 17 | 711374856192001 |
| 18 | 12804747411456001 |
| 19 | 243290200817664001 |