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 | 7 |
| 3 | 1 |
| 4 | 56 |
| 5 | 21 |
| 6 | 1 |
| 7 | 504 |
| 8 | 371 |
| 9 | 42 |
| 10 | 1 |
| 11 | 5040 |
| 12 | 6440 |
| 13 | 1295 |
| 14 | 70 |
| 15 | 1 |
| 16 | 55440 |
| 17 | 114520 |
| 18 | 36225 |
| 19 | 3325 |
| 20 | 105 |
| 21 | 1 |
| 22 | 665280 |
| 23 | 2116800 |
| 24 | 983920 |
| 25 | 135975 |
| 26 | 7105 |
| 27 | 147 |
| 28 | 1 |
| 29 | 8648640 |
| 30 | 40884480 |
| 31 | 26714800 |
| 32 | 5199145 |
| 33 | 398860 |
| 34 | 13426 |
| 35 | 196 |
| 36 | 1 |
| 37 | 121080960 |
| 38 | 826338240 |
| 39 | 735469280 |