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 | 5 |
| 1 | 25 |
| 2 | 121 |
| 3 | 585 |
| 4 | 2825 |
| 5 | 13641 |
| 6 | 65865 |
| 7 | 318025 |
| 8 | 1535561 |
| 9 | 7414345 |
| 10 | 35799625 |
| 11 | 172855881 |
| 12 | 834622025 |
| 13 | 4029911625 |
| 14 | 19458134601 |
| 15 | 93952184905 |
| 16 | 453641278025 |
| 17 | 2190373851721 |
| 18 | 10576060518985 |
| 19 | 51065737482825 |
| 20 | 246567192007241 |
| 21 | 1190531717960265 |
| 22 | 5748395639870025 |