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 | 0 |
| 2 | 2 |
| 3 | 61 |
| 4 | 8554 |
| 5 | 2662095 |
| 6 | 5675111511 |
| 7 | 35072966294346 |
| 8 | 1096128160677176696 |
| 9 | 121691314711314375091217 |