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 | 5 |
| 2 | 25 |
| 3 | 270 |
| 4 | 3430 |
| 5 | 52996 |
| 6 | 968905 |
| 7 | 20342540 |
| 8 | 480982030 |
| 9 | 12646108250 |
| 10 | 365943140101 |
| 11 | 11555148366323 |
| 12 | 395323293564108 |