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 | 9 |
| 2 | 58 |
| 3 | 330 |
| 4 | 1771 |
| 5 | 9219 |
| 6 | 47188 |
| 7 | 239220 |
| 8 | 1205941 |
| 9 | 6059229 |
| 10 | 30384718 |
| 11 | 152189310 |
| 12 | 761743711 |
| 13 | 3811110039 |
| 14 | 19062724648 |
| 15 | 95335146600 |
| 16 | 476740303081 |
| 17 | 2383895225649 |
| 18 | 11920057258978 |
| 19 | 59602029687090 |