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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 40320 |
| 9 | 362880 |
| 10 | 2 |
| 11 | 2 |
| 12 | 3 |
| 13 | 7 |
| 14 | 25 |
| 15 | 121 |
| 16 | 721 |
| 17 | 5041 |
| 18 | 40321 |
| 19 | 362881 |
| 20 | 3 |
| 21 | 3 |
| 22 | 4 |
| 23 | 8 |
| 24 | 26 |
| 25 | 122 |
| 26 | 722 |
| 27 | 5042 |
| 28 | 40322 |
| 29 | 362882 |
| 30 | 7 |
| 31 | 7 |
| 32 | 8 |
| 33 | 12 |
| 34 | 30 |
| 35 | 126 |
| 36 | 726 |
| 37 | 5046 |
| 38 | 40326 |
| 39 | 362886 |
| 40 | 25 |
| 41 | 25 |
| 42 | 26 |
| 43 | 30 |
| 44 | 48 |
| 45 | 144 |
| 46 | 744 |
| 47 | 5064 |
| 48 | 40344 |
| 49 | 362904 |
| 50 | 121 |
| 51 | 121 |
| 52 | 122 |
| 53 | 126 |