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 | 3 |
| 2 | 48 |
| 3 | 1287 |
| 4 | 48384 |
| 5 | 2340135 |
| 6 | 138378240 |
| 7 | 9672183675 |
| 8 | 780151357440 |
| 9 | 71322093677835 |
| 10 | 7287813911347200 |
| 11 | 823100991923184975 |
| 12 | 101819334240239616000 |
| 13 | 13690816766440373134575 |
| 14 | 1988199345147516813312000 |
| 15 | 310120801435080997013527875 |
| 16 | 51709528644340997758648320000 |