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 | 2 |
| 2 | 3 |
| 3 | 19 |
| 4 | 121 |
| 5 | 7148 |
| 6 | 326650 |
| 7 | 175765510 |
| 8 | 74872992399 |
| 9 | 400292326222730 |
| 10 | 1748923742658486631 |