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 | 5 |
| 2 | 25 |
| 3 | 110 |
| 4 | 470 |
| 5 | 1980 |
| 6 | 8274 |
| 7 | 34396 |
| 8 | 142474 |
| 9 | 588596 |
| 10 | 2426738 |
| 11 | 9989292 |
| 12 | 41065818 |
| 13 | 168636772 |
| 14 | 691859842 |
| 15 | 2836150748 |
| 16 | 11617837802 |
| 17 | 47559474708 |
| 18 | 194575978386 |
| 19 | 795613053964 |
| 20 | 3251559375226 |
| 21 | 13282278193604 |
| 22 | 54232112235170 |