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 | 3 |
| 2 | 27 |
| 3 | 243 |
| 4 | 2352 |
| 5 | 23607 |
| 6 | 242757 |
| 7 | 2539431 |
| 8 | 26904492 |
| 9 | 287858421 |
| 10 | 3104029755 |
| 11 | 33684914907 |
| 12 | 367483636746 |
| 13 | 4026930734223 |
| 14 | 44295829667055 |
| 15 | 488855016668727 |
| 16 | 5410588668898995 |
| 17 | 60035381850523284 |
| 18 | 667643481187840206 |
| 19 | 7439651232903588528 |
| 20 | 83050643822779921347 |