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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 63 |
| 6 | 318 |
| 7 | 2045 |
| 8 | 16999 |
| 9 | 183231 |
| 10 | 2567284 |
| 11 | 46749427 |
| 12 | 1104891746 |
| 13 | 33823827452 |
| 14 | 1338193159771 |
| 15 | 68275077901156 |
| 16 | 4483130665195087 |