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 | 6 |
| 2 | 96 |
| 3 | 1206 |
| 4 | 14016 |
| 5 | 157926 |
| 6 | 1755936 |
| 7 | 19409046 |
| 8 | 213968256 |
| 9 | 2355994566 |
| 10 | 25927658976 |
| 11 | 285262842486 |
| 12 | 3138184236096 |
| 13 | 34521491440806 |
| 14 | 379743730067616 |
| 15 | 4177217651837526 |
| 16 | 45949577275681536 |
| 17 | 505446265559840646 |
| 18 | 5559913498794965856 |
| 19 | 61159071374928218166 |
| 20 | 672749899565128368576 |