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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 36 |
| 7 | 60 |
| 8 | 209 |
| 9 | 387 |
| 10 | 1054 |
| 11 | 1468 |
| 12 | 6895 |
| 13 | 7001 |
| 14 | 23920 |
| 15 | 49496 |
| 16 | 126732 |
| 17 | 146046 |
| 18 | 638800 |
| 19 | 647502 |
| 20 | 2772935 |
| 21 | 4162861 |