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 | 10 |
| 6 | 32 |
| 7 | 84 |
| 8 | 198 |
| 9 | 438 |
| 10 | 932 |
| 11 | 1936 |
| 12 | 3962 |
| 13 | 8034 |
| 14 | 16200 |
| 15 | 32556 |
| 16 | 65294 |
| 17 | 130798 |
| 18 | 261836 |
| 19 | 523944 |
| 20 | 1048194 |
| 21 | 2096730 |
| 22 | 4193840 |
| 23 | 8388100 |
| 24 | 16776662 |
| 25 | 33553830 |
| 26 | 67108212 |
| 27 | 134217024 |
| 28 | 268434698 |
| 29 | 536870098 |
| 30 | 1073740952 |
| 31 | 2147482716 |
| 32 | 4294966302 |
| 33 | 8589933534 |
| 34 | 17179868060 |