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 | 22 |
| 3 | 272 |
| 4 | 2772 |
| 5 | 27172 |
| 6 | 271172 |
| 7 | 2718172 |
| 8 | 27188172 |
| 9 | 271828172 |
| 10 | 2718228172 |
| 11 | 27182828172 |
| 12 | 271828828172 |
| 13 | 2718281828172 |
| 14 | 27182811828172 |
| 15 | 271828181828172 |
| 16 | 2718281881828172 |
| 17 | 27182818281828172 |
| 18 | 271828182281828172 |