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 | 1 |
| 2 | 255 |
| 3 | 3280 |
| 4 | 43435 |
| 5 | 97656 |
| 6 | 836400 |
| 7 | 960800 |
| 8 | 6347715 |
| 9 | 8069620 |
| 10 | 24902280 |
| 11 | 21435888 |
| 12 | 142466800 |
| 13 | 67977560 |
| 14 | 245004000 |
| 15 | 320311680 |
| 16 | 866251507 |
| 17 | 435984840 |
| 18 | 2057753100 |
| 19 | 943531280 |
| 20 | 4241688360 |
| 21 | 3151424000 |
| 22 | 5466151440 |
| 23 | 3559590240 |
| 24 | 20820505200 |
| 25 | 7947261556 |
| 26 | 17334277800 |
| 27 | 18326727760 |