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 | 0 |
| 4 | 228 |
| 5 | 600 |
| 6 | 12357 |
| 7 | 68796 |
| 8 | 275888 |
| 9 | 872532 |
| 10 | 2344025 |
| 11 | 5580762 |
| 12 | 12107196 |
| 13 | 24392446 |
| 14 | 46261537 |
| 15 | 83426400 |
| 16 | 144157632 |
| 17 | 240119696 |
| 18 | 387393921 |
| 19 | 607715342 |
| 20 | 929951100 |