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 | 3 |
| 2 | 5 |
| 3 | 15 |
| 4 | 25 |
| 5 | 73 |
| 6 | 125 |
| 7 | 365 |
| 8 | 625 |
| 9 | 1249 |
| 10 | 3125 |
| 11 | 6245 |
| 12 | 15625 |
| 13 | 31225 |
| 14 | 62497 |
| 15 | 156125 |
| 16 | 312485 |
| 17 | 780625 |
| 18 | 1560001 |
| 19 | 3903125 |
| 20 | 7800005 |
| 21 | 19515625 |
| 22 | 39000025 |
| 23 | 78000049 |
| 24 | 195000125 |
| 25 | 390000245 |
| 26 | 1948441249 |
| 27 | 3905875009 |
| 28 | 7811750017 |
| 29 | 19529375045 |