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 | 5 |
| 2 | 40 |
| 3 | 275 |
| 4 | 1750 |
| 5 | 10625 |
| 6 | 62500 |
| 7 | 359375 |
| 8 | 2031250 |
| 9 | 11328125 |
| 10 | 62500000 |
| 11 | 341796875 |
| 12 | 1855468750 |
| 13 | 10009765625 |
| 14 | 53710937500 |
| 15 | 286865234375 |
| 16 | 1525878906250 |
| 17 | 8087158203125 |
| 18 | 42724609375000 |
| 19 | 225067138671875 |
| 20 | 1182556152343750 |
| 21 | 6198883056640625 |
| 22 | 32424926757812500 |