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 | 5 |
| 2 | 25 |
| 3 | 75 |
| 4 | 375 |
| 5 | 825 |
| 6 | 8125 |
| 7 | 13175 |
| 8 | 103125 |
| 9 | 327125 |
| 10 | 2445625 |
| 11 | 4884435 |
| 12 | 61640625 |
| 13 | 101732425 |
| 14 | 1017323125 |
| 15 | 3816215625 |
| 16 | 19104609375 |
| 17 | 47683838325 |
| 18 | 635787765625 |
| 19 | 1059638680675 |
| 20 | 11924780390625 |
| 21 | 39736963221875 |
| 22 | 238418603522125 |
| 23 | 541860418146375 |