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 | 48 |
| 2 | 648 |
| 3 | 15000 |
| 4 | 115248 |
| 5 | 1756920 |
| 6 | 4798248 |
| 7 | 24054048 |
| 8 | 46915560 |
| 9 | 147756048 |
| 10 | 594116040 |
| 11 | 886580160 |
| 12 | 2563852248 |
| 13 | 4747278480 |
| 14 | 6317944248 |
| 15 | 10774335648 |
| 16 | 22156470648 |
| 17 | 42168416280 |
| 18 | 51506528520 |
| 19 | 90438231048 |
| 20 | 128074872240 |