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 | 7 |
| 1 | 35 |
| 2 | 175 |
| 3 | 875 |
| 4 | 4375 |
| 5 | 21875 |
| 6 | 109375 |
| 7 | 546875 |
| 8 | 2734375 |
| 9 | 13671875 |
| 10 | 68359375 |
| 11 | 341796875 |
| 12 | 1708984375 |
| 13 | 8544921875 |
| 14 | 42724609375 |
| 15 | 213623046875 |
| 16 | 1068115234375 |
| 17 | 5340576171875 |
| 18 | 26702880859375 |
| 19 | 133514404296875 |
| 20 | 667572021484375 |
| 21 | 3337860107421875 |
| 22 | 16689300537109375 |