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 | 1 |
| 3 | 3 |
| 4 | 19 |
| 5 | 244 |
| 6 | 10101 |
| 7 | 1562298 |
| 8 | 885237542 |
| 9 | 1795141933300 |
| 10 | 13031553571814674 |
| 11 | 341286507770733602176 |
| 12 | 32523592049568306757117737 |
| 13 | 11366810480400463340177768296746 |
| 14 | 14669108426561606778443288692015619955 |
| 15 | 70315685953531425166863071956073529852161120 |