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 | 2 |
| 2 | 8 |
| 3 | 52 |
| 4 | 433 |
| 5 | 4276 |
| 6 | 58017 |
| 7 | 855463 |
| 8 | 13670443 |
| 9 | 235745794 |
| 10 | 5122022952 |
| 11 | 115172651558 |
| 12 | 2700441900575 |
| 13 | 66188170219650 |
| 14 | 1696382503295129 |
| 15 | 52131050479431445 |
| 16 | 1631282413260019671 |
| 17 | 52321326819923379190 |