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) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 1644 |
| 4 | 12015 |
| 5 | 97580 |
| 6 | 820820 |
| 7 | 7070805 |
| 8 | 61530000 |
| 9 | 538903800 |
| 10 | 4735474525 |
| 11 | 41696434728 |
| 12 | 367562042568 |
| 13 | 3242398676595 |
| 14 | 28614207114896 |
| 15 | 252584682127428 |
| 16 | 2229968979966475 |
| 17 | 19689354946616388 |
| 18 | 173855783327986060 |