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 | 4 |
| 4 | 349 |
| 5 | 9985 |
| 6 | 213230 |
| 7 | 4000444 |
| 8 | 69940479 |
| 9 | 1170549895 |
| 10 | 19024433560 |
| 11 | 302846958634 |
| 12 | 4748624978009 |
| 13 | 73628721516805 |
| 14 | 1132119741733890 |
| 15 | 17298702716660824 |
| 16 | 263082403948681939 |
| 17 | 3986935934969727715 |