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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 5 |
| 7 | 10 |
| 8 | 16 |
| 9 | 32 |
| 10 | 54 |
| 11 | 102 |
| 12 | 180 |
| 13 | 336 |
| 14 | 607 |
| 15 | 1144 |
| 16 | 2098 |
| 17 | 3960 |
| 18 | 7397 |
| 19 | 14022 |
| 20 | 26452 |
| 21 | 50404 |
| 22 | 95821 |
| 23 | 183322 |
| 24 | 350554 |
| 25 | 673044 |
| 26 | 1292634 |
| 27 | 2489502 |
| 28 | 4797694 |
| 29 | 9264396 |
| 30 | 17904220 |
| 31 | 34652962 |
| 32 | 67125898 |
| 33 | 130182972 |
| 34 | 252679320 |
| 35 | 490918440 |
| 36 | 954505718 |
| 37 | 1857413460 |
| 38 | 3616951513 |
| 39 | 7048412792 |
| 40 | 13744169104 |