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 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 35 |
| 5 | 155 |
| 6 | 239 |
| 7 | 779 |
| 8 | 2855 |
| 9 | 5279 |
| 10 | 9095 |
| 11 | 15695 |
| 12 | 59135 |
| 13 | 350699 |
| 14 | 183395 |
| 15 | 1352339 |
| 16 | 1477295 |
| 17 | 1077959 |
| 18 | 6922920 |
| 19 | 3038555 |
| 20 | 12705840 |
| 21 | 14199120 |