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 | 47 |
| 2 | 336 |
| 3 | 2128 |
| 4 | 12848 |
| 5 | 75808 |
| 6 | 441824 |
| 7 | 2557024 |
| 8 | 14737312 |
| 9 | 84726992 |
| 10 | 486388912 |
| 11 | 2789840688 |
| 12 | 15995087184 |
| 13 | 91689974592 |
| 14 | 525608606912 |
| 15 | 3013422222272 |
| 16 | 17280193763392 |
| 17 | 99117586397296 |
| 18 | 568696489153808 |
| 19 | 3263973649089808 |