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 | 66 |
| 2 | 4355 |
| 3 | 287364 |
| 4 | 18961669 |
| 5 | 1251182790 |
| 6 | 82559102471 |
| 7 | 5447649580296 |
| 8 | 359462313197065 |
| 9 | 23719065021425994 |
| 10 | 1565098829100918539 |
| 11 | 103272803655639197580 |
| 12 | 6814439942443086121741 |
| 13 | 449649763397588044837326 |