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 | 1032 |
| 3 | 59076 |
| 4 | 1056832 |
| 5 | 9765750 |
| 6 | 60966432 |
| 7 | 282475592 |
| 8 | 1082196480 |
| 9 | 3488379453 |
| 10 | 10078254000 |
| 11 | 25937425932 |
| 12 | 62433407232 |
| 13 | 137858494046 |
| 14 | 291514810944 |
| 15 | 576921447000 |
| 16 | 1108169199616 |
| 17 | 2015993905362 |
| 18 | 3600007595496 |
| 19 | 6131066264660 |
| 20 | 10320757104000 |
| 21 | 16687528072992 |
| 22 | 26767423561824 |