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 | 0 |
| 1 | 2 |
| 2 | 28 |
| 3 | 168 |
| 4 | 660 |
| 5 | 2002 |
| 6 | 5096 |
| 7 | 11424 |
| 8 | 23256 |
| 9 | 43890 |
| 10 | 77924 |
| 11 | 131560 |
| 12 | 212940 |
| 13 | 332514 |
| 14 | 503440 |
| 15 | 742016 |
| 16 | 1068144 |
| 17 | 1505826 |
| 18 | 2083692 |
| 19 | 2835560 |
| 20 | 3801028 |
| 21 | 5026098 |
| 22 | 6563832 |
| 23 | 8475040 |
| 24 | 10829000 |
| 25 | 13704210 |
| 26 | 17189172 |
| 27 | 21383208 |
| 28 | 26397308 |
| 29 | 32355010 |
| 30 | 39393312 |
| 31 | 47663616 |
| 32 | 57332704 |