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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 4 |
| 8 | 8 |
| 9 | 16 |
| 10 | 34 |
| 11 | 67 |
| 12 | 137 |
| 13 | 272 |
| 14 | 540 |
| 15 | 1061 |
| 16 | 2074 |
| 17 | 4022 |
| 18 | 7763 |
| 19 | 14914 |
| 20 | 28556 |
| 21 | 54499 |
| 22 | 103729 |
| 23 | 196945 |
| 24 | 373201 |
| 25 | 705964 |
| 26 | 1333413 |
| 27 | 2515298 |
| 28 | 4739834 |
| 29 | 8926089 |