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 | 9 |
| 3 | 62 |
| 4 | 572 |
| 5 | 6604 |
| 6 | 91526 |
| 7 | 1480044 |
| 8 | 27353448 |
| 9 | 568731648 |
| 10 | 13138994112 |
| 11 | 333895239072 |
| 12 | 9256507508112 |
| 13 | 278000959058016 |
| 14 | 8991458660924112 |
| 15 | 311585506208924064 |
| 16 | 11517363473843526912 |
| 17 | 452332548042633835776 |