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 | 15 |
| 2 | 125 |
| 3 | 875 |
| 4 | 5625 |
| 5 | 34375 |
| 6 | 203125 |
| 7 | 1171875 |
| 8 | 6640625 |
| 9 | 37109375 |
| 10 | 205078125 |
| 11 | 1123046875 |
| 12 | 6103515625 |
| 13 | 32958984375 |
| 14 | 177001953125 |
| 15 | 946044921875 |
| 16 | 5035400390625 |
| 17 | 26702880859375 |
| 18 | 141143798828125 |
| 19 | 743865966796875 |
| 20 | 3910064697265625 |
| 21 | 20503997802734375 |
| 22 | 107288360595703125 |