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 | 1 |
| 2 | 30 |
| 3 | 270 |
| 4 | 1400 |
| 5 | 5250 |
| 6 | 15876 |
| 7 | 41160 |
| 8 | 95040 |
| 9 | 200475 |
| 10 | 393250 |
| 11 | 726726 |
| 12 | 1277640 |
| 13 | 2153060 |
| 14 | 3498600 |
| 15 | 5508000 |
| 16 | 8434176 |
| 17 | 12601845 |
| 18 | 18421830 |
| 19 | 26407150 |
| 20 | 37191000 |
| 21 | 51546726 |
| 22 | 70409900 |
| 23 | 94902600 |
| 24 | 126360000 |
| 25 | 166359375 |
| 26 | 216751626 |
| 27 | 279695430 |
| 28 | 357694120 |
| 29 | 453635400 |
| 30 | 570834000 |