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 | 3 |
| 3 | 8 |
| 4 | 20 |
| 5 | 50 |
| 6 | 125 |
| 7 | 313 |
| 8 | 784 |
| 9 | 1964 |
| 10 | 4920 |
| 11 | 12325 |
| 12 | 30875 |
| 13 | 77344 |
| 14 | 193752 |
| 15 | 485362 |
| 16 | 1215865 |
| 17 | 3045825 |
| 18 | 7630000 |
| 19 | 19113672 |
| 20 | 47881056 |
| 21 | 119945321 |
| 22 | 300471235 |
| 23 | 752701000 |
| 24 | 1885567500 |
| 25 | 4723475586 |
| 26 | 11832629493 |
| 27 | 29641546393 |
| 28 | 74254101600 |