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 | 12339 |
| 2 | 19119 |
| 3 | 30681 |
| 4 | 53739 |
| 5 | 127689 |
| 6 | 322275 |
| 7 | 878625 |
| 8 | 2967411 |
| 9 | 9800745 |
| 10 | 32238603 |
| 11 | 121975089 |
| 12 | 436928547 |
| 13 | 1519783929 |
| 14 | 5949509979 |
| 15 | 21894837441 |
| 16 | 77688357939 |
| 17 | 307915900809 |
| 18 | 1145251722315 |
| 19 | 4096740213585 |
| 20 | 16319916055011 |
| 21 | 60974970119385 |