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 | 5 |
| 4 | 22 |
| 5 | 161 |
| 6 | 1406 |
| 7 | 14241 |
| 8 | 164461 |
| 9 | 2115335 |
| 10 | 29903139 |
| 11 | 460066726 |
| 12 | 7644586673 |
| 13 | 136336779596 |
| 14 | 2596190669230 |
| 15 | 52552267768902 |
| 16 | 1126421027176730 |