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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 7 |
| 6 | 24 |
| 7 | 25 |
| 8 | 26 |
| 9 | 120 |
| 10 | 121 |
| 11 | 122 |
| 12 | 126 |
| 13 | 127 |
| 14 | 720 |
| 15 | 721 |
| 16 | 722 |
| 17 | 726 |
| 18 | 727 |
| 19 | 744 |
| 20 | 745 |
| 21 | 746 |
| 22 | 5040 |
| 23 | 5041 |
| 24 | 5042 |
| 25 | 5046 |
| 26 | 5047 |
| 27 | 5064 |
| 28 | 5065 |
| 29 | 5066 |
| 30 | 5160 |
| 31 | 5161 |
| 32 | 5162 |
| 33 | 5166 |
| 34 | 5167 |
| 35 | 40320 |
| 36 | 40321 |
| 37 | 40322 |
| 38 | 40326 |
| 39 | 40327 |
| 40 | 40344 |
| 41 | 40345 |
| 42 | 40346 |
| 43 | 40440 |
| 44 | 40441 |
| 45 | 40442 |