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 | 5 |
| 2 | 48 |
| 3 | 434 |
| 4 | 3695 |
| 5 | 29165 |
| 6 | 218283 |
| 7 | 1569995 |
| 8 | 10950776 |
| 9 | 74621972 |
| 10 | 499495257 |
| 11 | 3297443264 |
| 12 | 21533211312 |
| 13 | 139411685398 |
| 14 | 896352197825 |
| 15 | 5730605551626 |
| 16 | 36465861350230 |