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 | 3 |
| 2 | 19 |
| 3 | 271 |
| 4 | 7365 |
| 5 | 326011 |
| 6 | 21295783 |
| 7 | 1924223799 |
| 8 | 229714292041 |
| 9 | 35007742568755 |
| 10 | 6630796801779771 |
| 11 | 1527863209528564063 |
| 12 | 420814980652048751629 |
| 13 | 136526522051229388285611 |