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) |
|---|---|
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 4 |
| 7 | 21 |
| 8 | 8 |
| 9 | 85 |
| 10 | 16 |
| 11 | 341 |
| 12 | 32 |
| 13 | 1365 |
| 14 | 64 |
| 15 | 5461 |
| 16 | 128 |
| 17 | 21845 |
| 18 | 256 |
| 19 | 87381 |
| 20 | 512 |
| 21 | 349525 |
| 22 | 1024 |
| 23 | 1398101 |
| 24 | 2048 |
| 25 | 5592405 |
| 26 | 4096 |
| 27 | 22369621 |
| 28 | 8192 |
| 29 | 89478485 |
| 30 | 16384 |
| 31 | 357913941 |
| 32 | 32768 |
| 33 | 1431655765 |
| 34 | 65536 |
| 35 | 5726623061 |
| 36 | 131072 |
| 37 | 22906492245 |
| 38 | 262144 |
| 39 | 91625968981 |
| 40 | 524288 |
| 41 | 366503875925 |