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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 14 |
| 5 | 102 |
| 6 | 603 |
| 7 | 4227 |
| 8 | 24942 |
| 9 | 311276 |
| 10 | 3039543 |
| 11 | 33478363 |
| 12 | 401734770 |
| 13 | 5222553212 |
| 14 | 73115744891 |
| 15 | 1096736173379 |
| 16 | 12943332326750 |
| 17 | 305107217238968 |
| 18 | 5362734402377967 |
| 19 | 102024181104606979 |
| 20 | 2040455253185256114 |
| 21 | 42849570085332342072 |
| 22 | 942690540710286167499 |
| 23 | 21681882436603204659939 |