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 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | 9 |
| 6 | 6 |
| 7 | 1 |
| 8 | 34 |
| 9 | 72 |
| 10 | 24 |
| 11 | 1 |
| 12 | 125 |
| 13 | 650 |
| 14 | 600 |
| 15 | 120 |
| 16 | 1 |
| 17 | 461 |
| 18 | 5400 |
| 19 | 10500 |
| 20 | 5400 |
| 21 | 720 |
| 22 | 1 |
| 23 | 1715 |
| 24 | 43757 |
| 25 | 161700 |
| 26 | 161700 |
| 27 | 52920 |
| 28 | 5040 |
| 29 | 1 |
| 30 | 6434 |
| 31 | 353192 |
| 32 | 2361016 |
| 33 | 4116000 |
| 34 | 2493120 |
| 35 | 564480 |
| 36 | 40320 |
| 37 | 1 |
| 38 | 24309 |
| 39 | 2862330 |
| 40 | 33731208 |
| 41 | 96960024 |
| 42 | 97161120 |
| 43 | 39372480 |
| 44 | 6531840 |
| 45 | 362880 |