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 | 40 |
| 2 | 2816 |
| 3 | 104448 |
| 4 | 3014656 |
| 5 | 76021760 |
| 6 | 1761607680 |
| 7 | 38520487936 |
| 8 | 807453851648 |
| 9 | 16389595201536 |
| 10 | 324355930193920 |
| 11 | 6289206510878720 |
| 12 | 119908340078739456 |
| 13 | 2254051613498933248 |
| 14 | 41865462136036130816 |
| 15 | 769575104325070356480 |
| 16 | 14019525496019259228160 |
| 17 | 253384476596474400997376 |