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 | 1 |
| 1 | 4 |
| 2 | 52 |
| 3 | 658 |
| 4 | 7600 |
| 5 | 83194 |
| 6 | 882352 |
| 7 | 9176458 |
| 8 | 94235200 |
| 9 | 959646394 |
| 10 | 9717524752 |
| 11 | 98022673258 |
| 12 | 986158712800 |
| 13 | 9903110989594 |
| 14 | 99321776927152 |
| 15 | 995252438490058 |
| 16 | 9966767069430400 |
| 17 | 99767369486012794 |
| 18 | 998371586402089552 |