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 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 4 |
| 8 | 10 |
| 9 | 21 |
| 10 | 39 |
| 11 | 70 |
| 12 | 125 |
| 13 | 229 |
| 14 | 435 |
| 15 | 859 |
| 16 | 1739 |
| 17 | 3574 |
| 18 | 7384 |
| 19 | 15239 |
| 20 | 31312 |
| 21 | 63968 |
| 22 | 129898 |
| 23 | 262316 |
| 24 | 527169 |
| 25 | 1055254 |
| 26 | 2105849 |
| 27 | 4192933 |
| 28 | 8335832 |
| 29 | 16557580 |
| 30 | 32877010 |
| 31 | 65286137 |
| 32 | 129695835 |
| 33 | 257817166 |
| 34 | 512918318 |
| 35 | 1021351641 |
| 36 | 2035674817 |
| 37 | 4061093104 |
| 38 | 8108844651 |