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 | 0 |
| 5 | 312 |
| 6 | 3024 |
| 7 | 14868 |
| 8 | 51744 |
| 9 | 145152 |
| 10 | 350784 |
| 11 | 759528 |
| 12 | 1511136 |
| 13 | 2810808 |
| 14 | 4948944 |
| 15 | 8324316 |
| 16 | 13470912 |
| 17 | 21088704 |
| 18 | 32078592 |
| 19 | 47581776 |
| 20 | 69023808 |
| 21 | 98163576 |
| 22 | 137147472 |
| 23 | 188568996 |
| 24 | 255534048 |
| 25 | 341732160 |
| 26 | 451513920 |
| 27 | 589974840 |
| 28 | 763045920 |
| 29 | 977591160 |
| 30 | 1241512272 |