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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | 3 |
| 9 | 2 |
| 10 | 9 |
| 11 | 24 |
| 12 | 24 |
| 13 | 24 |
| 14 | 9 |
| 15 | 216 |
| 16 | 540 |
| 17 | 610 |
| 18 | 420 |
| 19 | 210 |
| 20 | 44 |
| 21 | 7570 |
| 22 | 18000 |
| 23 | 20175 |
| 24 | 13720 |
| 25 | 6300 |
| 26 | 1920 |
| 27 | 265 |
| 28 | 357435 |
| 29 | 829920 |
| 30 | 909741 |
| 31 | 617610 |
| 32 | 284235 |
| 33 | 91140 |
| 34 | 19005 |
| 35 | 1854 |
| 36 | 22040361 |
| 37 | 50223600 |
| 38 | 54295528 |
| 39 | 36663312 |
| 40 | 17072790 |
| 41 | 5679184 |
| 42 | 1337280 |
| 43 | 203952 |
| 44 | 14833 |