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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 27 |
| 6 | 94 |
| 7 | 425 |
| 8 | 2100 |
| 9 | 12252 |
| 10 | 79865 |
| 11 | 576220 |
| 12 | 4532457 |
| 13 | 38657929 |
| 14 | 354600915 |
| 15 | 3485914368 |
| 16 | 36545825768 |
| 17 | 407149542540 |