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 | 4 |
| 3 | 3 |
| 4 | 16 |
| 5 | 24 |
| 6 | 73 |
| 7 | 144 |
| 8 | 364 |
| 9 | 795 |
| 10 | 1888 |
| 11 | 4272 |
| 12 | 9937 |
| 13 | 22752 |
| 14 | 52564 |
| 15 | 120819 |
| 16 | 278512 |
| 17 | 640968 |
| 18 | 1476505 |
| 19 | 3399408 |
| 20 | 7828924 |
| 21 | 18027147 |
| 22 | 41513920 |
| 23 | 95595360 |
| 24 | 220137121 |
| 25 | 506923200 |
| 26 | 1167334564 |
| 27 | 2688104163 |
| 28 | 6190107856 |
| 29 | 14254420344 |
| 30 | 32824743913 |
| 31 | 75588004944 |
| 32 | 174062236684 |