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 | 25 |
| 2 | 625 |
| 3 | 2209 |
| 4 | 10609 |
| 5 | 60025 |
| 6 | 277729 |
| 7 | 1247689 |
| 8 | 5890329 |
| 9 | 27426169 |
| 10 | 125776225 |
| 11 | 580858201 |
| 12 | 2686867225 |
| 13 | 12388803025 |
| 14 | 57136775089 |
| 15 | 263724358681 |
| 16 | 1216770043329 |
| 17 | 5612971227241 |
| 18 | 25896730187689 |
| 19 | 119479087561201 |
| 20 | 551206670239681 |