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 | 10 |
| 2 | 250 |
| 3 | 3750 |
| 4 | 42500 |
| 5 | 406250 |
| 6 | 3468750 |
| 7 | 27343750 |
| 8 | 203125000 |
| 9 | 1441406250 |
| 10 | 9863281250 |
| 11 | 65527343750 |
| 12 | 424804687500 |
| 13 | 2697753906250 |
| 14 | 16833496093750 |
| 15 | 103454589843750 |
| 16 | 627441406250000 |
| 17 | 3761291503906250 |
| 18 | 22315979003906250 |