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 | 7 |
| 2 | 87 |
| 3 | 387 |
| 4 | 5387 |
| 5 | 95387 |
| 6 | 195387 |
| 7 | 4195387 |
| 8 | 64195387 |
| 9 | 464195387 |
| 10 | 2464195387 |
| 11 | 62464195387 |
| 12 | 262464195387 |
| 13 | 7262464195387 |
| 14 | 27262464195387 |
| 15 | 627262464195387 |
| 16 | 5627262464195387 |
| 17 | 75627262464195387 |
| 18 | 575627262464195387 |
| 19 | 4575627262464195387 |
| 20 | 4575627262464195387 |