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 | 56 |
| 1 | 756 |
| 2 | 5292 |
| 3 | 25872 |
| 4 | 99792 |
| 5 | 324324 |
| 6 | 924924 |
| 7 | 2378376 |
| 8 | 5621616 |
| 9 | 12388376 |
| 10 | 25729704 |
| 11 | 50791104 |
| 12 | 95938752 |
| 13 | 174350232 |
| 14 | 306211752 |
| 15 | 521694096 |
| 16 | 864913896 |
| 17 | 1399125420 |
| 18 | 2213431220 |
| 19 | 3431347920 |
| 20 | 5221616400 |
| 21 | 7811703900 |
| 22 | 11504509380 |
| 23 | 16698853080 |
| 24 | 23914406880 |
| 25 | 33821804016 |