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 | 20 |
| 3 | 213 |
| 4 | 2152 |
| 5 | 21594 |
| 6 | 216009 |
| 7 | 2159776 |
| 8 | 21595522 |
| 9 | 215951111 |
| 10 | 2159507603 |
| 11 | 21595061256 |
| 12 | 215950604593 |