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) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 780 |
| 4 | 68151 |
| 5 | 7280046 |
| 6 | 873319806 |
| 7 | 113187903900 |
| 8 | 15506951007015 |
| 9 | 2214490608127986 |
| 10 | 326564039118851370 |