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 | 2200380 |
| 2 | 8801520 |
| 3 | 14913024 |
| 4 | 35206080 |
| 5 | 140896000 |
| 6 | 459818240 |
| 7 | 775898880 |
| 8 | 2253189120 |
| 9 | 16785793024 |
| 10 | 22648550400 |
| 11 | 36051025920 |
| 12 | 51001180160 |
| 13 | 144204103680 |