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 | 0 |
| 2 | 0 |
| 3 | 16 |
| 4 | 119 |
| 5 | 916 |
| 6 | 7079 |
| 7 | 54431 |
| 8 | 430016 |
| 9 | 3484767 |
| 10 | 28764495 |
| 11 | 241298621 |
| 12 | 2052293026 |
| 13 | 17663498098 |
| 14 | 153590992984 |
| 15 | 1347587381486 |
| 16 | 11917605558274 |
| 17 | 106139298948562 |
| 18 | 951243890034661 |