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 | 71 |
| 3 | 701 |
| 4 | 7001 |
| 5 | 70001 |
| 6 | 700001 |
| 7 | 7000003 |
| 8 | 70000027 |
| 9 | 700000001 |
| 10 | 7000000001 |
| 11 | 70000000033 |
| 12 | 700000000009 |
| 13 | 7000000000009 |
| 14 | 70000000000009 |
| 15 | 700000000000051 |
| 16 | 7000000000000037 |
| 17 | 70000000000000003 |
| 18 | 700000000000000033 |