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 | 24 |
| 2 | 552 |
| 3 | 12420 |
| 4 | 279312 |
| 5 | 6278448 |
| 6 | 141128460 |
| 7 | 3172286040 |
| 8 | 71306671656 |
| 9 | 1602831568932 |
| 10 | 36028452924816 |
| 11 | 809847670933488 |
| 12 | 18203758337942892 |
| 13 | 409184133605301912 |
| 14 | 9197642162005213224 |
| 15 | 206744627643931781316 |