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 | 0 |
| 1 | 7 |
| 2 | 105 |
| 3 | 1267 |
| 4 | 14385 |
| 5 | 160027 |
| 6 | 1767465 |
| 7 | 19470787 |
| 8 | 214293345 |
| 9 | 2357685547 |
| 10 | 25936376025 |
| 11 | 285307476307 |
| 12 | 3138411599505 |
| 13 | 34522645035067 |
| 14 | 379749565147785 |
| 15 | 4177247095673827 |
| 16 | 45949725568604865 |
| 17 | 505447011319424587 |
| 18 | 5559917244772754745 |
| 19 | 61159090173536639347 |
| 20 | 672749993833048381425 |