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) |
|---|---|
| 9 | 1 |
| 10 | 8 |
| 11 | 52 |
| 12 | 270 |
| 13 | 1203 |
| 14 | 4682 |
| 15 | 16346 |
| 16 | 51901 |
| 17 | 151945 |
| 18 | 414116 |
| 19 | 1059945 |
| 20 | 2565394 |
| 21 | 5907070 |
| 22 | 13005279 |
| 23 | 27498902 |
| 24 | 56052155 |
| 25 | 110506991 |
| 26 | 211327231 |
| 27 | 393002091 |
| 28 | 712326630 |
| 29 | 1260881177 |
| 30 | 2183476067 |
| 31 | 3705027759 |
| 32 | 6169083918 |
| 33 | 10092371963 |