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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 8 |
| 5 | 16 |
| 6 | 122 |
| 7 | 365 |
| 8 | 2795 |
| 9 | 11051 |
| 10 | 86472 |
| 11 | 422005 |
| 12 | 3403127 |
| 13 | 19628064 |
| 14 | 164029595 |
| 15 | 1084948961 |
| 16 | 9433737120 |
| 17 | 69998462014 |
| 18 | 635182667816 |
| 19 | 5199414528808 |
| 20 | 49344452550230 |
| 21 | 439841775811967 |
| 22 | 4371727233798927 |
| 23 | 42000637216351225 |
| 24 | 437489737355466560 |
| 25 | 4493269587087402967 |