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 | 3 |
| 4 | 9 |
| 5 | 17 |
| 6 | 60 |
| 7 | 166 |
| 8 | 606 |
| 9 | 2106 |
| 10 | 8046 |
| 11 | 30801 |
| 12 | 122442 |
| 13 | 491539 |
| 14 | 2007571 |
| 15 | 8272122 |
| 16 | 34408439 |
| 17 | 144084776 |
| 18 | 607112043 |
| 19 | 2571118048 |
| 20 | 10938419260 |
| 21 | 46720437135 |