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 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 44 |
| 5 | 178 |
| 6 | 892 |
| 7 | 5354 |
| 8 | 37480 |
| 9 | 299842 |
| 10 | 2698580 |
| 11 | 26985802 |
| 12 | 296843824 |
| 13 | 3562125890 |
| 14 | 46307636572 |
| 15 | 648306912010 |
| 16 | 9724603680152 |
| 17 | 155593658882434 |
| 18 | 2645092201001380 |