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 | 13 |
| 2 | 97 |
| 3 | 625 |
| 4 | 3841 |
| 5 | 23233 |
| 6 | 139777 |
| 7 | 839425 |
| 8 | 5038081 |
| 9 | 30231553 |
| 10 | 181395457 |
| 11 | 1088385025 |
| 12 | 6530334721 |
| 13 | 39182057473 |
| 14 | 235092443137 |
| 15 | 1410554855425 |
| 16 | 8463329525761 |
| 17 | 50779977940993 |
| 18 | 304679869218817 |
| 19 | 1828079218458625 |