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 | 245 |
| 2 | 731 |
| 3 | 2189 |
| 4 | 19685 |
| 5 | 177149 |
| 6 | 531443 |
| 7 | 1594325 |
| 8 | 43046723 |
| 9 | 129140165 |
| 10 | 387420491 |
| 11 | 1162261469 |
| 12 | 3486784403 |
| 13 | 10460353205 |
| 14 | 31381059611 |
| 15 | 94143178829 |
| 16 | 847288609445 |
| 17 | 7625597484989 |
| 18 | 22876792454963 |
| 19 | 68630377364885 |
| 20 | 205891132094651 |