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 | 4 |
| 2 | 25 |
| 3 | 226 |
| 4 | 2713 |
| 5 | 40696 |
| 6 | 732529 |
| 7 | 15383110 |
| 8 | 369194641 |
| 9 | 9968255308 |
| 10 | 299047659241 |
| 11 | 9868572754954 |
| 12 | 355268619178345 |
| 13 | 13855476147955456 |
| 14 | 581929998214129153 |
| 15 | 26186849919635811886 |
| 16 | 1256968796142518970529 |