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 | 72 |
| 3 | 648 |
| 4 | 3200 |
| 5 | 11250 |
| 6 | 31752 |
| 7 | 76832 |
| 8 | 165888 |
| 9 | 328050 |
| 10 | 605000 |
| 11 | 1054152 |
| 12 | 1752192 |
| 13 | 2798978 |
| 14 | 4321800 |
| 15 | 6480000 |
| 16 | 9469952 |
| 17 | 13530402 |
| 18 | 18948168 |
| 19 | 26064200 |
| 20 | 35280000 |
| 21 | 47064402 |
| 22 | 61960712 |
| 23 | 80594208 |
| 24 | 103680000 |
| 25 | 132031250 |
| 26 | 166567752 |
| 27 | 208324872 |