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) |
|---|---|
| 1 | 25 |
| 2 | 1375 |
| 3 | 69375 |
| 4 | 3471875 |
| 5 | 173609375 |
| 6 | 8680546875 |
| 7 | 434027734375 |
| 8 | 21701388671875 |
| 9 | 1085069443359375 |
| 10 | 54253472216796875 |
| 11 | 2712673611083984375 |
| 12 | 135633680555419921875 |
| 13 | 6781684027777099609375 |
| 14 | 339084201388885498046875 |
| 15 | 16954210069444427490234375 |