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 | 4 |
| 2 | 41 |
| 3 | 127 |
| 4 | 295 |
| 5 | 1012 |
| 6 | 10415 |
| 7 | 32257 |
| 8 | 74929 |
| 9 | 257044 |
| 10 | 2645369 |
| 11 | 8193151 |
| 12 | 19031671 |
| 13 | 65288164 |
| 14 | 671913311 |
| 15 | 2081028097 |
| 16 | 4833969505 |
| 17 | 16582936612 |
| 18 | 170663335625 |
| 19 | 528572943487 |
| 20 | 1227809222599 |
| 21 | 4212000611284 |
| 22 | 43347815335439 |
| 23 | 134255446617601 |
| 24 | 311858708570641 |
| 25 | 1069831572329524 |
| 26 | 11010174431865881 |