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 | 241 |
| 2 | 9361 |
| 3 | 131041 |
| 4 | 996001 |
| 5 | 5109841 |
| 6 | 20015281 |
| 7 | 64495681 |
| 8 | 179375041 |
| 9 | 444798001 |
| 10 | 1006201681 |
| 11 | 2111519521 |
| 12 | 4162485601 |
| 13 | 7783236241 |
| 14 | 13909734001 |
| 15 | 23903867521 |
| 16 | 39696408961 |
| 17 | 63963339121 |
| 18 | 100340378641 |
| 19 | 153680892001 |