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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 80 |
| 5 | 22200 |
| 6 | 226864 |
| 7 | 961728 |
| 8 | 2625640 |
| 9 | 5543744 |
| 10 | 9907248 |
| 11 | 15787528 |
| 12 | 23174472 |
| 13 | 32030516 |
| 14 | 42322492 |
| 15 | 54034656 |
| 16 | 67163804 |
| 17 | 81709936 |
| 18 | 97673052 |
| 19 | 115053152 |
| 20 | 133850236 |
| 21 | 154064304 |
| 22 | 175695356 |
| 23 | 198743392 |
| 24 | 223208412 |
| 25 | 249090416 |
| 26 | 276389404 |
| 27 | 305105376 |
| 28 | 335238332 |
| 29 | 366788272 |