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 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 98 |
| 5 | 1398 |
| 6 | 39956 |
| 7 | 2354240 |
| 8 | 286394544 |
| 9 | 71225744048 |
| 10 | 35884971729760 |
| 11 | 36419817759267072 |
| 12 | 74221711070826087424 |
| 13 | 303193538300703211111936 |
| 14 | 2480118087478081928075065344 |
| 15 | 40601989279034990139321984265216 |
| 16 | 1329877330680067685563700135615633408 |