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 | 50 |
| 3 | 375 |
| 4 | 2500 |
| 5 | 15625 |
| 6 | 93750 |
| 7 | 546875 |
| 8 | 3125000 |
| 9 | 17578125 |
| 10 | 97656250 |
| 11 | 537109375 |
| 12 | 2929687500 |
| 13 | 15869140625 |
| 14 | 85449218750 |
| 15 | 457763671875 |
| 16 | 2441406250000 |
| 17 | 12969970703125 |
| 18 | 68664550781250 |
| 19 | 362396240234375 |
| 20 | 1907348632812500 |
| 21 | 10013580322265625 |
| 22 | 52452087402343750 |