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 | 13 |
| 2 | 90 |
| 3 | 1443 |
| 4 | 6658 |
| 5 | 81923 |
| 6 | 827395 |
| 7 | 17956868 |
| 8 | 157286403 |
| 9 | 1434451971 |
| 10 | 12884901891 |
| 11 | 114353504259 |
| 12 | 1005022347267 |
| 13 | 8761733283843 |
| 14 | 166026255794180 |
| 15 | 1337006139375619 |
| 16 | 11434920928870403 |
| 17 | 97390341941886979 |
| 18 | 1799188051134513156 |
| 19 | 14231374822490767363 |
| 20 | 119903836479112085507 |