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 | 6 |
| 4 | 114 |
| 5 | 843 |
| 6 | 4122 |
| 7 | 14988 |
| 8 | 45414 |
| 9 | 119340 |
| 10 | 281442 |
| 11 | 608616 |
| 12 | 1228812 |
| 13 | 2338779 |
| 14 | 4240284 |
| 15 | 7371414 |
| 16 | 12354156 |
| 17 | 20052846 |
| 18 | 31653108 |
| 19 | 48726846 |
| 20 | 73358964 |
| 21 | 108233781 |
| 22 | 156793974 |
| 23 | 223400004 |
| 24 | 313529940 |
| 25 | 433929258 |
| 26 | 592922880 |
| 27 | 800651538 |
| 28 | 1069378740 |