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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 7 |
| 7 | 11 |
| 8 | 15 |
| 9 | 22 |
| 10 | 30 |
| 11 | 56 |
| 12 | 1002 |
| 13 | 10143 |
| 14 | 75175 |
| 15 | 451276 |
| 16 | 2323520 |
| 17 | 10619863 |
| 18 | 44108109 |
| 19 | 169229875 |
| 20 | 214481126 |
| 21 | 679903203 |
| 22 | 2056148051 |
| 23 | 5964539504 |
| 24 | 16670689208 |
| 25 | 45060624582 |
| 26 | 118159068427 |
| 27 | 301384802048 |
| 28 | 749474411781 |
| 29 | 1820701100652 |
| 30 | 4714566886083 |
| 31 | 10963707205259 |