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 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 75 |
| 4 | 572 |
| 5 | 6293 |
| 6 | 92962 |
| 7 | 1395180 |
| 8 | 25482135 |
| 9 | 582310475 |
| 10 | 13697614020 |
| 11 | 364311810217 |
| 12 | 11551145067139 |
| 13 | 380339218683310 |
| 14 | 13636394439014770 |
| 15 | 563142483841155427 |
| 16 | 24264229405883569164 |
| 17 | 1114389674994185476663 |