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 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 85 |
| 4 | 1587 |
| 5 | 41981 |
| 6 | 1484643 |
| 7 | 67306429 |
| 8 | 3790883659 |
| 9 | 258899180989 |
| 10 | 21029065282803 |
| 11 | 1999625128004813 |
| 12 | 219691693064750283 |
| 13 | 27580289062408474861 |
| 14 | 3919060527556589637043 |
| 15 | 625165018565884343909053 |