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 | 7 |
| 2 | 25 |
| 3 | 115 |
| 4 | 601 |
| 5 | 3362 |
| 6 | 19609 |
| 7 | 117649 |
| 8 | 720601 |
| 9 | 4483735 |
| 10 | 28247525 |
| 11 | 179756977 |
| 12 | 1153440601 |
| 13 | 7453000801 |
| 14 | 48444505204 |
| 15 | 316504100663 |
| 16 | 2077058160601 |
| 17 | 13684147881601 |
| 18 | 90467422106137 |
| 19 | 599941851861745 |
| 20 | 3989613314880601 |