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 | 6 |
| 3 | 84 |
| 4 | 2010 |
| 5 | 70596 |
| 6 | 3331006 |
| 7 | 199417056 |
| 8 | 14559631506 |
| 9 | 1259526351000 |
| 10 | 126308710634414 |
| 11 | 14434568970310656 |
| 12 | 1854260500658184762 |
| 13 | 264771440776810595320 |
| 14 | 41635233706865669566110 |