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 | 0 |
| 2 | 128 |
| 3 | 4374 |
| 4 | 49152 |
| 5 | 312500 |
| 6 | 1399680 |
| 7 | 4941258 |
| 8 | 14680064 |
| 9 | 38263752 |
| 10 | 90000000 |
| 11 | 194871710 |
| 12 | 394149888 |
| 13 | 752982204 |
| 14 | 1370375552 |
| 15 | 2392031250 |
| 16 | 4026531840 |
| 17 | 6565418768 |
| 18 | 10407740544 |
| 19 | 16089691302 |
| 20 | 24320000000 |
| 21 | 36021770820 |
| 22 | 52381515648 |
| 23 | 74906159834 |
| 24 | 105488842752 |
| 25 | 146484375000 |