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 | 5 |
| 3 | 14 |
| 4 | 30 |
| 5 | 66 |
| 6 | 147 |
| 7 | 316 |
| 8 | 640 |
| 9 | 1316 |
| 10 | 2685 |
| 11 | 5389 |
| 12 | 10865 |
| 13 | 21890 |
| 14 | 43794 |
| 15 | 87894 |
| 16 | 176103 |
| 17 | 352503 |
| 18 | 705339 |
| 19 | 1410939 |
| 20 | 2822283 |
| 21 | 5644683 |
| 22 | 11290059 |
| 23 | 22586380 |
| 24 | 45177389 |
| 25 | 90362673 |
| 26 | 180726709 |
| 27 | 361467845 |
| 28 | 722962014 |
| 29 | 1445926558 |
| 30 | 2891903234 |