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) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 75 |
| 5 | 1225 |
| 6 | 19845 |
| 7 | 160083 |
| 8 | 1288287 |
| 9 | 41409225 |
| 10 | 1329696225 |
| 11 | 10667118605 |
| 12 | 85530896451 |
| 13 | 1371086188563 |
| 14 | 21972535073125 |
| 15 | 176021737014375 |
| 16 | 1409850293610375 |
| 17 | 90324408810638025 |
| 18 | 5786075364399106425 |
| 19 | 46326420401234675625 |
| 20 | 370882277949065911875 |
| 21 | 5938020471163465810125 |