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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 16 |
| 6 | 32 |
| 7 | 192 |
| 8 | 768 |
| 9 | 4608 |
| 10 | 18432 |
| 11 | 184320 |
| 12 | 737280 |
| 13 | 8847360 |
| 14 | 53084160 |
| 15 | 424673280 |
| 16 | 3397386240 |
| 17 | 54358179840 |
| 18 | 326149079040 |
| 19 | 5870683422720 |
| 20 | 46965467381760 |
| 21 | 563585608581120 |
| 22 | 5635856085811200 |
| 23 | 123988833887846400 |
| 24 | 991910671102771200 |
| 25 | 19838213422055424000 |