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 | 4 |
| 2 | 24 |
| 3 | 250 |
| 4 | 3096 |
| 5 | 40834 |
| 6 | 554664 |
| 7 | 7647250 |
| 8 | 106237176 |
| 9 | 1481554114 |
| 10 | 20701400904 |
| 11 | 289537131250 |
| 12 | 4051542498456 |
| 13 | 56707753666594 |
| 14 | 793811662272744 |
| 15 | 11112685048647250 |
| 16 | 155572843119354936 |