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 | 1 |
| 4 | 3 |
| 5 | 11 |
| 6 | 27 |
| 7 | 71 |
| 8 | 159 |
| 9 | 367 |
| 10 | 783 |
| 11 | 1695 |
| 12 | 3519 |
| 13 | 7359 |
| 14 | 15039 |
| 15 | 30847 |
| 16 | 62463 |
| 17 | 126719 |
| 18 | 255231 |
| 19 | 514559 |
| 20 | 1033215 |
| 21 | 2075647 |
| 22 | 4160511 |
| 23 | 8341503 |
| 24 | 16703487 |
| 25 | 33452031 |
| 26 | 66949119 |
| 27 | 133996543 |
| 28 | 268091391 |
| 29 | 536395775 |
| 30 | 1073004543 |
| 31 | 2146467839 |
| 32 | 4293394431 |
| 33 | 8587771903 |