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) |
|---|---|
| 1 | 12 |
| 2 | 444 |
| 3 | 16872 |
| 4 | 640680 |
| 5 | 24328980 |
| 6 | 923860548 |
| 7 | 35082371856 |
| 8 | 1332206269968 |
| 9 | 50588755886940 |
| 10 | 1921040517433740 |
| 11 | 72948950906595192 |
| 12 | 2770139093933183544 |
| 13 | 105192336618554379492 |
| 14 | 3994538652411133237140 |
| 15 | 151687276455004508631840 |