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 | 2 |
| 2 | 6 |
| 3 | 56 |
| 4 | 5272 |
| 5 | 47350056 |
| 6 | 3820809588459176 |
| 7 | 24878564279781563409541239097464 |
| 8 | 1054787931172699885204409659788147413348784265452313995416385160 |