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 | 5 |
| 2 | 26 |
| 3 | 140 |
| 4 | 775 |
| 5 | 4375 |
| 6 | 25000 |
| 7 | 143750 |
| 8 | 828125 |
| 9 | 4765625 |
| 10 | 27343750 |
| 11 | 156250000 |
| 12 | 888671875 |
| 13 | 5029296875 |
| 14 | 28320312500 |
| 15 | 158691406250 |
| 16 | 885009765625 |
| 17 | 4913330078125 |
| 18 | 27160644531250 |
| 19 | 149536132812500 |
| 20 | 820159912109375 |