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 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 25 |
| 6 | 133 |
| 7 | 631 |
| 8 | 3857 |
| 9 | 25905 |
| 10 | 188181 |
| 11 | 1515283 |
| 12 | 13376125 |
| 13 | 128102625 |
| 14 | 1317606101 |
| 15 | 14534145947 |
| 16 | 170922533545 |
| 17 | 2138089212789 |