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 | 4 |
| 2 | 55 |
| 3 | 36 |
| 4 | 716 |
| 5 | 1188 |
| 6 | 4055 |
| 7 | 13832 |
| 8 | 18821 |
| 9 | 190806 |
| 10 | 1542023 |
| 11 | 3971816 |
| 12 | 13881356 |
| 13 | 55009989 |
| 14 | 154057624 |
| 15 | 551727536 |
| 16 | 1881662989 |
| 17 | 4014051821 |
| 18 | 15448244536 |
| 19 | 185043243523 |
| 20 | 405480132286 |
| 21 | 550651031786 |
| 22 | 4425284190954 |
| 23 | 4881712198556 |