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 | 7 |
| 3 | 45 |
| 4 | 650 |
| 5 | 24520 |
| 6 | 2625117 |
| 7 | 836488618 |
| 8 | 818230288201 |
| 9 | 2513135860300849 |
| 10 | 24686082394548211147 |
| 11 | 787959836124458000837941 |
| 12 | 82905574521614049485027140026 |