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 | 1 |
| 1 | 4 |
| 2 | 12 |
| 3 | 30 |
| 4 | 60 |
| 5 | 210 |
| 6 | 330 |
| 7 | 660 |
| 8 | 2730 |
| 9 | 3570 |
| 10 | 6270 |
| 11 | 12540 |
| 12 | 53130 |
| 13 | 79170 |
| 14 | 110670 |
| 15 | 221340 |
| 16 | 514140 |
| 17 | 1799490 |
| 18 | 2284590 |
| 19 | 4196010 |
| 20 | 6750870 |
| 21 | 13501740 |
| 22 | 37532220 |
| 23 | 97350330 |
| 24 | 131362770 |
| 25 | 189620970 |
| 26 | 379241940 |
| 27 | 735844830 |
| 28 | 1471689660 |