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 | 36 |
| 4 | 288 |
| 5 | 1320 |
| 6 | 4464 |
| 7 | 12348 |
| 8 | 29568 |
| 9 | 63504 |
| 10 | 125280 |
| 11 | 230868 |
| 12 | 402336 |
| 13 | 669240 |
| 14 | 1070160 |
| 15 | 1654380 |
| 16 | 2483712 |
| 17 | 3634464 |
| 18 | 5199552 |
| 19 | 7290756 |
| 20 | 10041120 |
| 21 | 13607496 |
| 22 | 18173232 |
| 23 | 23951004 |
| 24 | 31185792 |
| 25 | 40158000 |
| 26 | 51186720 |
| 27 | 64633140 |
| 28 | 80904096 |
| 29 | 100455768 |
| 30 | 123797520 |