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 | 2 |
| 1 | 2 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 8 |
| 6 | 29 |
| 7 | 80 |
| 8 | 193 |
| 9 | 432 |
| 10 | 925 |
| 11 | 1928 |
| 12 | 3953 |
| 13 | 8024 |
| 14 | 16189 |
| 15 | 32544 |
| 16 | 65281 |
| 17 | 130784 |
| 18 | 261821 |
| 19 | 523928 |
| 20 | 1048177 |
| 21 | 2096712 |
| 22 | 4193821 |
| 23 | 8388080 |
| 24 | 16776641 |
| 25 | 33553808 |
| 26 | 67108189 |
| 27 | 134217000 |
| 28 | 268434673 |
| 29 | 536870072 |
| 30 | 1073740925 |
| 31 | 2147482688 |