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 | 3 |
| 6 | 11 |
| 7 | 28 |
| 8 | 71 |
| 9 | 165 |
| 10 | 372 |
| 11 | 807 |
| 12 | 1725 |
| 13 | 3611 |
| 14 | 7481 |
| 15 | 15345 |
| 16 | 31274 |
| 17 | 63392 |
| 18 | 128040 |
| 19 | 257865 |
| 20 | 518318 |
| 21 | 1040277 |
| 22 | 2085714 |
| 23 | 4178596 |
| 24 | 8367205 |
| 25 | 16748151 |
| 26 | 33515214 |
| 27 | 67056139 |
| 28 | 134147231 |
| 29 | 268341515 |
| 30 | 536746350 |
| 31 | 1073577185 |
| 32 | 2147266984 |
| 33 | 4294683056 |
| 34 | 8589563136 |
| 35 | 17179385180 |