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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 32 |
| 5 | 175 |
| 6 | 1012 |
| 7 | 6230 |
| 8 | 40819 |
| 9 | 283944 |
| 10 | 2090424 |
| 11 | 16235417 |
| 12 | 132609666 |
| 13 | 1135846062 |
| 14 | 10175352709 |
| 15 | 95108406130 |
| 16 | 925496853980 |
| 17 | 9357279554071 |
| 18 | 98118527430960 |
| 19 | 1065259283215810 |
| 20 | 11956366813630835 |
| 21 | 138539436100687988 |
| 22 | 1655071323662574756 |
| 23 | 20361556640795422729 |