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 | 1 |
| 2 | 9 |
| 3 | 25 |
| 4 | 169 |
| 5 | 441 |
| 6 | 3025 |
| 7 | 7921 |
| 8 | 54289 |
| 9 | 142129 |
| 10 | 974169 |
| 11 | 2550409 |
| 12 | 17480761 |
| 13 | 45765225 |
| 14 | 313679521 |
| 15 | 821223649 |
| 16 | 5628750625 |
| 17 | 14736260449 |
| 18 | 101003831721 |
| 19 | 264431464441 |
| 20 | 1812440220361 |
| 21 | 4745030099481 |
| 22 | 32522920134769 |