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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 26 |
| 7 | 57 |
| 8 | 118 |
| 9 | 237 |
| 10 | 486 |
| 11 | 989 |
| 12 | 1992 |
| 13 | 3997 |
| 14 | 8038 |
| 15 | 16133 |
| 16 | 32331 |
| 17 | 64777 |
| 18 | 129810 |
| 19 | 260191 |
| 20 | 521325 |
| 21 | 1043924 |
| 22 | 2089305 |
| 23 | 4180716 |