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 | 5 |
| 2 | 25 |
| 3 | 100 |
| 4 | 375 |
| 5 | 1276 |
| 6 | 4155 |
| 7 | 12775 |
| 8 | 37935 |
| 9 | 108460 |
| 10 | 301533 |
| 11 | 815075 |
| 12 | 2153995 |
| 13 | 5567685 |
| 14 | 14123030 |
| 15 | 35183376 |
| 16 | 86259665 |
| 17 | 208293520 |
| 18 | 496100890 |
| 19 | 1166243015 |
| 20 | 2708878924 |
| 21 | 6220640495 |
| 22 | 14134118490 |
| 23 | 31792023545 |