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 | 4 |
| 4 | 11 |
| 5 | 27 |
| 6 | 80 |
| 7 | 218 |
| 8 | 654 |
| 9 | 1923 |
| 10 | 5924 |
| 11 | 18310 |
| 12 | 58176 |
| 13 | 186341 |
| 14 | 606814 |
| 15 | 1993420 |
| 16 | 6618160 |
| 17 | 22134640 |