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 | 4 |
| 3 | 36 |
| 4 | 276 |
| 5 | 1360 |
| 6 | 4752 |
| 7 | 13340 |
| 8 | 32084 |
| 9 | 68796 |
| 10 | 135040 |
| 11 | 247152 |
| 12 | 427380 |
| 13 | 705144 |
| 14 | 1118416 |
| 15 | 1715220 |
| 16 | 2555252 |
| 17 | 3711620 |
| 18 | 5272704 |
| 19 | 7344136 |
| 20 | 10050900 |
| 21 | 13539552 |
| 22 | 17980560 |
| 23 | 23570764 |
| 24 | 30535956 |
| 25 | 39133580 |
| 26 | 49655552 |
| 27 | 62431200 |
| 28 | 77830324 |