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 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 48 |
| 5 | 190 |
| 6 | 873 |
| 7 | 4504 |
| 8 | 25989 |
| 9 | 164686 |
| 10 | 1141079 |
| 11 | 8550794 |
| 12 | 69034238 |
| 13 | 596165874 |
| 14 | 5489044279 |
| 15 | 53611773888 |
| 16 | 553937164945 |
| 17 | 6032197300602 |
| 18 | 69070616521369 |
| 19 | 829210595494742 |
| 20 | 10416695090023412 |
| 21 | 136614200179164806 |
| 22 | 1867352453003735541 |