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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 69 |
| 6 | 416 |
| 7 | 3277 |
| 8 | 33590 |
| 9 | 430131 |
| 10 | 6700328 |
| 11 | 124069971 |
| 12 | 2680915918 |
| 13 | 66579269891 |
| 14 | 1876496610172 |
| 15 | 59387269231505 |
| 16 | 2091422223924852 |
| 17 | 81321166136299741 |
| 18 | 3467614972592015460 |