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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 13 |
| 6 | 31 |
| 7 | 71 |
| 8 | 159 |
| 9 | 346 |
| 10 | 739 |
| 11 | 1559 |
| 12 | 3258 |
| 13 | 6756 |
| 14 | 13922 |
| 15 | 28547 |
| 16 | 58300 |
| 17 | 118668 |
| 18 | 240880 |
| 19 | 487835 |
| 20 | 986085 |
| 21 | 1990025 |
| 22 | 4010658 |
| 23 | 8073786 |
| 24 | 16237521 |
| 25 | 32629241 |
| 26 | 65522823 |
| 27 | 131498801 |
| 28 | 263774439 |
| 29 | 528880599 |
| 30 | 1060044148 |
| 31 | 2124001923 |