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 | 3 |
| 3 | 2 |
| 4 | 13 |
| 5 | 10 |
| 6 | 6 |
| 7 | 75 |
| 8 | 62 |
| 9 | 42 |
| 10 | 24 |
| 11 | 541 |
| 12 | 466 |
| 13 | 342 |
| 14 | 216 |
| 15 | 120 |
| 16 | 4683 |
| 17 | 4142 |
| 18 | 3210 |
| 19 | 2184 |
| 20 | 1320 |
| 21 | 720 |
| 22 | 47293 |
| 23 | 42610 |
| 24 | 34326 |
| 25 | 24696 |
| 26 | 15960 |
| 27 | 9360 |
| 28 | 5040 |
| 29 | 545835 |
| 30 | 498542 |
| 31 | 413322 |
| 32 | 310344 |
| 33 | 211560 |
| 34 | 131760 |
| 35 | 75600 |
| 36 | 40320 |
| 37 | 7087261 |
| 38 | 6541426 |
| 39 | 5544342 |
| 40 | 4304376 |
| 41 | 3063000 |
| 42 | 2005200 |
| 43 | 1214640 |
| 44 | 685440 |
| 45 | 362880 |
| 46 | 102247563 |
| 47 | 95160302 |