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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 5 |
| 5 | 6 |
| 6 | 20 |
| 7 | 21 |
| 8 | 22 |
| 9 | 28 |
| 10 | 58 |
| 11 | 120 |
| 12 | 144 |
| 13 | 1100 |
| 14 | 1926 |
| 15 | 2892 |
| 16 | 4773 |
| 17 | 5214 |
| 18 | 17241 |
| 19 | 18980 |
| 20 | 31265 |