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 | 0 |
| 2 | 3 |
| 3 | 12 |
| 4 | 75 |
| 5 | 522 |
| 6 | 4179 |
| 7 | 37608 |
| 8 | 376083 |
| 9 | 4136910 |
| 10 | 49642923 |
| 11 | 645357996 |
| 12 | 9035011947 |
| 13 | 135525179202 |
| 14 | 2168402867235 |
| 15 | 36862848742992 |
| 16 | 663531277373859 |
| 17 | 12607094270103318 |