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 | 1 |
| 2 | 0 |
| 3 | 8 |
| 4 | 79 |
| 5 | 1974 |
| 6 | 62266 |
| 7 | 2484382 |
| 8 | 119138166 |
| 9 | 6655170642 |
| 10 | 423677826986 |
| 11 | 30242576462856 |
| 12 | 2390359529372724 |
| 13 | 207127434998494421 |
| 14 | 19516867860507198208 |
| 15 | 1986288643031862123264 |
| 16 | 217094567491104327256049 |
| 17 | 25357029929230564723578520 |
| 18 | 3151672341378566296926684684 |