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 | 1 |
| 2 | 288 |
| 3 | 10206 |
| 4 | 133120 |
| 5 | 984375 |
| 6 | 5062176 |
| 7 | 20235628 |
| 8 | 67239936 |
| 9 | 193975965 |
| 10 | 500500000 |
| 11 | 1179859626 |
| 12 | 2581383168 |
| 13 | 5304663091 |
| 14 | 10334288160 |
| 15 | 19227375000 |
| 16 | 34368126976 |
| 17 | 59306007033 |
| 18 | 99196651296 |
| 19 | 161367371830 |
| 20 | 256032000000 |
| 21 | 397182906351 |
| 22 | 603691298848 |
| 23 | 900650348676 |