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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 14 |
| 4 | 231 |
| 5 | 2973 |
| 6 | 35585 |
| 7 | 409849 |
| 8 | 4600247 |
| 9 | 50678212 |
| 10 | 550454756 |
| 11 | 5913771637 |
| 12 | 62981797962 |
| 13 | 665997804082 |
| 14 | 7001087934965 |
| 15 | 73232029374751 |
| 16 | 762783057783010 |
| 17 | 7916319351632036 |
| 18 | 81898808371556517 |