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 | 3 |
| 3 | 1 |
| 4 | 4 |
| 5 | 23 |
| 6 | 51 |
| 7 | 20 |
| 8 | 115 |
| 9 | 5568 |
| 10 | 12 |
| 11 | 3521 |
| 12 | 40 |
| 13 | 1058 |
| 14 | 2104 |
| 15 | 668 |
| 16 | 7540 |
| 17 | 1298 |
| 18 | 83648 |
| 19 | 16631833 |
| 20 | 70630 |