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 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 11 |
| 6 | 25 |
| 7 | 55 |
| 8 | 117 |
| 9 | 241 |
| 10 | 493 |
| 11 | 1001 |
| 12 | 2019 |
| 13 | 4061 |
| 14 | 8149 |
| 15 | 16331 |
| 16 | 32705 |
| 17 | 65461 |
| 18 | 130981 |
| 19 | 262037 |
| 20 | 524161 |
| 21 | 1048425 |
| 22 | 2096975 |
| 23 | 4194097 |
| 24 | 8388365 |
| 25 | 16776933 |
| 26 | 33554103 |
| 27 | 67108481 |
| 28 | 134217285 |
| 29 | 268434945 |
| 30 | 536870321 |
| 31 | 1073741145 |
| 32 | 2147482869 |
| 33 | 4294966401 |
| 34 | 8589933569 |