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 | 4 |
| 3 | 24 |
| 4 | 207 |
| 5 | 5570 |
| 6 | 261939 |
| 7 | 20599895 |
| 8 | 3819208252 |
| 9 | 1400212345305 |
| 10 | 937962844219314 |
| 11 | 1312275096984570369 |
| 12 | 3708386833907642906568 |
| 13 | 20177474743877943669370721 |
| 14 | 220442917573207336661039688056 |