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) |
|---|---|
| 4 | 21 |
| 5 | 483 |
| 6 | 483 |
| 7 | 6468 |
| 8 | 15018 |
| 9 | 6468 |
| 10 | 66066 |
| 11 | 258972 |
| 12 | 258972 |
| 13 | 66066 |
| 14 | 570570 |
| 15 | 3288327 |
| 16 | 5554188 |
| 17 | 3288327 |
| 18 | 570570 |
| 19 | 4390386 |
| 20 | 34374186 |
| 21 | 85421118 |
| 22 | 85421118 |
| 23 | 34374186 |
| 24 | 4390386 |
| 25 | 31039008 |
| 26 | 313530000 |
| 27 | 1059255456 |
| 28 | 1558792200 |
| 29 | 1059255456 |
| 30 | 313530000 |
| 31 | 31039008 |