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 | 2 |
| 5 | 4 |
| 6 | 11 |
| 7 | 24 |
| 8 | 51 |
| 9 | 103 |
| 10 | 207 |
| 11 | 417 |
| 12 | 815 |
| 13 | 1622 |
| 14 | 3164 |
| 15 | 6210 |
| 16 | 12146 |
| 17 | 23711 |
| 18 | 46295 |
| 19 | 90307 |
| 20 | 176369 |
| 21 | 344155 |
| 22 | 672091 |
| 23 | 1312721 |
| 24 | 2565048 |
| 25 | 5013566 |
| 26 | 9804910 |
| 27 | 19183069 |
| 28 | 37547164 |
| 29 | 73526846 |
| 30 | 144042323 |
| 31 | 282317826 |
| 32 | 553564500 |
| 33 | 1085869406 |
| 34 | 2130916524 |
| 35 | 4183381508 |
| 36 | 8215884036 |