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 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 119 |
| 5 | 2476 |
| 6 | 64370 |
| 7 | 1974468 |
| 8 | 69109563 |
| 9 | 2702001936 |
| 10 | 116298977966 |
| 11 | 5453395749960 |
| 12 | 276403464191890 |
| 13 | 15049886389916756 |
| 14 | 875933263547340216 |
| 15 | 54268470230312961400 |
| 16 | 3566244291096016078419 |
| 17 | 247800396100716098128236 |
| 18 | 18155541676448293842945990 |