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 | 5 |
| 2 | 24 |
| 3 | 130 |
| 4 | 792 |
| 5 | 5080 |
| 6 | 34584 |
| 7 | 247360 |
| 8 | 1817112 |
| 9 | 13918720 |
| 10 | 108848664 |
| 11 | 869866240 |
| 12 | 7169995032 |
| 13 | 59085276160 |
| 14 | 505735077144 |
| 15 | 4311229112320 |
| 16 | 37428004374552 |
| 17 | 335520388710400 |
| 18 | 2861870689152024 |
| 19 | 27669446179225600 |
| 20 | 223578655251963672 |
| 21 | 2398913308953149440 |
| 22 | 17708639883984065304 |