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) |
|---|---|
| 2 | 41 |
| 3 | 401 |
| 4 | 4001 |
| 5 | 40009 |
| 6 | 400009 |
| 7 | 4000037 |
| 8 | 40000003 |
| 9 | 400000009 |
| 10 | 4000000007 |
| 11 | 40000000003 |
| 12 | 400000000019 |
| 13 | 4000000000039 |
| 14 | 40000000000001 |
| 15 | 400000000000063 |
| 16 | 4000000000000021 |
| 17 | 40000000000000063 |
| 18 | 400000000000000013 |