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 | 28 |
| 3 | 234 |
| 4 | 1008 |
| 5 | 3100 |
| 6 | 7740 |
| 7 | 16758 |
| 8 | 32704 |
| 9 | 58968 |
| 10 | 99900 |
| 11 | 160930 |
| 12 | 248688 |
| 13 | 371124 |
| 14 | 537628 |
| 15 | 759150 |
| 16 | 1048320 |
| 17 | 1419568 |
| 18 | 1889244 |
| 19 | 2475738 |
| 20 | 3199600 |
| 21 | 4083660 |
| 22 | 5153148 |
| 23 | 6435814 |
| 24 | 7962048 |
| 25 | 9765000 |
| 26 | 11880700 |
| 27 | 14348178 |
| 28 | 17209584 |
| 29 | 20510308 |
| 30 | 24299100 |
| 31 | 28628190 |