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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 12 |
| 5 | 44 |
| 6 | 236 |
| 7 | 2028 |
| 8 | 29164 |
| 9 | 719340 |
| 10 | 30943724 |
| 11 | 2350770668 |
| 12 | 318680099308 |
| 13 | 77793540073964 |
| 14 | 34472347123476972 |
| 15 | 27928291976711924204 |
| 16 | 41631598900551078537708 |
| 17 | 114829789064202679162399212 |