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 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 75 |
| 4 | 500 |
| 5 | 3125 |
| 6 | 18750 |
| 7 | 109375 |
| 8 | 625000 |
| 9 | 3515625 |
| 10 | 19531250 |
| 11 | 107421875 |
| 12 | 585937500 |
| 13 | 3173828125 |
| 14 | 17089843750 |
| 15 | 91552734375 |
| 16 | 488281250000 |
| 17 | 2593994140625 |
| 18 | 13732910156250 |
| 19 | 72479248046875 |
| 20 | 381469726562500 |