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 | 12 |
| 3 | 108 |
| 4 | 480 |
| 5 | 1500 |
| 6 | 3780 |
| 7 | 8232 |
| 8 | 16128 |
| 9 | 29160 |
| 10 | 49500 |
| 11 | 79860 |
| 12 | 123552 |
| 13 | 184548 |
| 14 | 267540 |
| 15 | 378000 |
| 16 | 522240 |
| 17 | 707472 |
| 18 | 941868 |
| 19 | 1234620 |
| 20 | 1596000 |
| 21 | 2037420 |
| 22 | 2571492 |
| 23 | 3212088 |
| 24 | 3974400 |
| 25 | 4875000 |
| 26 | 5931900 |
| 27 | 7164612 |
| 28 | 8594208 |
| 29 | 10243380 |
| 30 | 12136500 |