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 | 4 |
| 6 | 6 |
| 7 | 4 |
| 8 | 1 |
| 9 | 32 |
| 10 | 44 |
| 11 | 60 |
| 12 | 70 |
| 13 | 56 |
| 14 | 28 |
| 15 | 8 |
| 16 | 1 |
| 17 | 2720 |
| 18 | 4288 |
| 19 | 6312 |
| 20 | 9004 |
| 21 | 11992 |
| 22 | 14372 |
| 23 | 15400 |
| 24 | 14630 |
| 25 | 11968 |
| 26 | 8104 |
| 27 | 4376 |
| 28 | 1820 |
| 29 | 560 |
| 30 | 120 |
| 31 | 16 |
| 32 | 1 |
| 33 | 31327104 |
| 34 | 50882720 |
| 35 | 80963520 |
| 36 | 125489856 |
| 37 | 188637520 |
| 38 | 273984664 |
| 39 | 383305008 |
| 40 | 515461260 |
| 41 | 665277632 |
| 42 | 822361736 |