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 | 2 |
| 4 | 11 |
| 5 | 94 |
| 6 | 365 |
| 7 | 2891 |
| 8 | 30242 |
| 9 | 207653 |
| 10 | 2119577 |
| 11 | 19807006 |
| 12 | 218836016 |
| 13 | 3149604508 |
| 14 | 57791376424 |
| 15 | 900430886016 |
| 16 | 25428213982688 |