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 | 12 |
| 2 | 13 |
| 3 | 15 |
| 4 | 17 |
| 5 | 25 |
| 6 | 47 |
| 7 | 117 |
| 8 | 409 |
| 9 | 1985 |
| 10 | 13269 |
| 11 | 116555 |
| 12 | 1301043 |
| 13 | 17911307 |
| 14 | 296651169 |
| 15 | 5792367991 |
| 16 | 131137897895 |
| 17 | 3395020992813 |
| 18 | 99343099511585 |