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 | 5 |
| 3 | 111 |
| 4 | 5232 |
| 5 | 49910 |
| 6 | 3527745 |
| 7 | 76435695 |
| 8 | 2673350008 |
| 9 | 33507517680 |
| 10 | 4954123399050 |
| 11 | 71186377398675 |
| 12 | 14169975006172392 |
| 13 | 230478985529218998 |
| 14 | 3970388091885696481 |
| 15 | 144475785096372785055 |
| 16 | 47074452451240708494000 |
| 17 | 948198128552832829175504 |
| 18 | 380523626987174239611912012 |
| 19 | 8410876353715824882741160170 |