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 | 114 |
| 4 | 2910 |
| 5 | 26490 |
| 6 | 145110 |
| 7 | 582540 |
| 8 | 1891764 |
| 9 | 5263020 |
| 10 | 13010580 |
| 11 | 29297070 |
| 12 | 61162530 |
| 13 | 119933814 |
| 14 | 223098330 |
| 15 | 396734520 |
| 16 | 678599880 |
| 17 | 1121985720 |
| 18 | 1800456264 |
| 19 | 2813598090 |
| 20 | 4293914310 |
| 21 | 6415006290 |
| 22 | 9401194110 |
| 23 | 13538735364 |
| 24 | 19188810300 |