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 | 5 |
| 2 | 32 |
| 3 | 145 |
| 4 | 512 |
| 5 | 1649 |
| 6 | 5392 |
| 7 | 18785 |
| 8 | 69632 |
| 9 | 268705 |
| 10 | 1058576 |
| 11 | 4208945 |
| 12 | 16797952 |
| 13 | 67137425 |
| 14 | 268473872 |
| 15 | 1073792449 |
| 16 | 4295032832 |
| 17 | 17179952705 |
| 18 | 68719581712 |
| 19 | 274878037265 |
| 20 | 1099511787776 |
| 21 | 4398046705585 |
| 22 | 17592186278672 |