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 | 0 |
| 1 | 6 |
| 2 | 24 |
| 3 | 78 |
| 4 | 384 |
| 5 | 8190 |
| 6 | 8472 |
| 7 | 178110 |
| 8 | 193824 |
| 9 | 4231662 |
| 10 | 7072056 |
| 11 | 102812142 |
| 12 | 208526592 |
| 13 | 2508914454 |
| 14 | 5268441144 |
| 15 | 62304671286 |
| 16 | 124116667488 |
| 17 | 1547651742990 |
| 18 | 2850706506936 |
| 19 | 38100453950670 |