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 | 1 |
| 2 | 5 |
| 3 | 25 |
| 4 | 35 |
| 5 | 175 |
| 6 | 385 |
| 7 | 1225 |
| 8 | 1925 |
| 9 | 9625 |
| 10 | 13475 |
| 11 | 48125 |
| 12 | 55825 |
| 13 | 148225 |
| 14 | 279125 |
| 15 | 390775 |
| 16 | 1395625 |
| 17 | 1730575 |
| 18 | 4298525 |
| 19 | 8652875 |
| 20 | 12114025 |
| 21 | 43264375 |
| 22 | 60570125 |
| 23 | 133254275 |
| 24 | 302850625 |
| 25 | 423990875 |
| 26 | 642043325 |
| 27 | 2119954375 |