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 | 26 |
| 4 | 169 |
| 5 | 1230 |
| 6 | 9593 |
| 7 | 78499 |
| 8 | 664580 |
| 9 | 5761456 |
| 10 | 50847535 |
| 11 | 455052512 |
| 12 | 4118054814 |
| 13 | 37607912019 |
| 14 | 346065536840 |
| 15 | 3204941750803 |
| 16 | 29844570422670 |
| 17 | 279238341033926 |
| 18 | 2623557157654234 |
| 19 | 24739954287740861 |
| 20 | 234057667276344608 |
| 21 | 2220819602560918841 |
| 22 | 21127269486018731929 |