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 | 1 |
| 2 | 9 |
| 3 | 1095 |
| 4 | 145415 |
| 5 | 15661597 |
| 6 | 1418159011 |
| 7 | 112976454947 |
| 8 | 8812020831683 |
| 9 | 706152947468301 |
| 10 | 58015563977931125 |