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 | 1160 |
| 3 | 18240 |
| 4 | 287160 |
| 5 | 2955700 |
| 6 | 29861820 |
| 7 | 263890620 |
| 8 | 2271291760 |
| 9 | 18578622510 |
| 10 | 148166461700 |
| 11 | 1154270708140 |
| 12 | 8816903664840 |
| 13 | 66466271481610 |
| 14 | 493981029964240 |
| 15 | 3639806487902700 |
| 16 | 26549365603051040 |
| 17 | 192467514066590100 |
| 18 | 1385199533746259460 |
| 19 | 9923453811044261140 |
| 20 | 70715845300102361800 |