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 | 77 |
| 4 | 1044 |
| 5 | 14784 |
| 6 | 227877 |
| 7 | 3862305 |
| 8 | 71983440 |
| 9 | 1469813400 |
| 10 | 32718512925 |
| 11 | 789901955325 |
| 12 | 20578796752500 |
| 13 | 575836554270600 |
| 14 | 17232413940017325 |
| 15 | 549370878062313825 |
| 16 | 18591830334684129600 |
| 17 | 665771181527890746000 |
| 18 | 25154357611638416671125 |
| 19 | 1000094581801108086418125 |
| 20 | 41741166856778766269392500 |