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 | 0 |
| 1 | 5 |
| 2 | 81 |
| 3 | 1409 |
| 4 | 26433 |
| 5 | 514625 |
| 6 | 10180161 |
| 7 | 202704449 |
| 8 | 4046898753 |
| 9 | 80880453185 |
| 10 | 1617148888641 |
| 11 | 32339296372289 |
| 12 | 646756476241473 |
| 13 | 12934893915194945 |
| 14 | 258695993426822721 |
| 15 | 5173904789519844929 |
| 16 | 103477975158264022593 |
| 17 | 2069558538108217443905 |