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) |
|---|---|
| 5 | 4 |
| 6 | 53 |
| 7 | 429 |
| 8 | 2748 |
| 9 | 15342 |
| 10 | 78339 |
| 11 | 376159 |
| 12 | 1728458 |
| 13 | 7689744 |
| 14 | 33393393 |
| 15 | 142376385 |
| 16 | 598555320 |
| 17 | 2489143090 |
| 18 | 10264270175 |
| 19 | 42048021027 |
| 20 | 171366151974 |
| 21 | 695585112660 |
| 22 | 2814484154445 |
| 23 | 11359684937605 |
| 24 | 45759869226260 |
| 25 | 184050366838134 |
| 26 | 739376299832763 |
| 27 | 2967455421451239 |