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 | 2 |
| 3 | 6 |
| 4 | 31 |
| 5 | 181 |
| 6 | 1332 |
| 7 | 10510 |
| 8 | 88054 |
| 9 | 757202 |
| 10 | 6650140 |
| 11 | 59248825 |
| 12 | 534180521 |
| 13 | 4862936054 |