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 | 25 |
| 2 | 375 |
| 3 | 4375 |
| 4 | 43750 |
| 5 | 393750 |
| 6 | 3281250 |
| 7 | 25781250 |
| 8 | 193359375 |
| 9 | 1396484375 |
| 10 | 9775390625 |
| 11 | 66650390625 |
| 12 | 444335937500 |
| 13 | 2905273437500 |
| 14 | 18676757812500 |
| 15 | 118286132812500 |
| 16 | 739288330078125 |
| 17 | 4566192626953125 |
| 18 | 27904510498046875 |