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) |
|---|---|
| 1 | 0 |
| 2 | 64 |
| 3 | 512 |
| 4 | 4096 |
| 5 | 32768 |
| 6 | 262144 |
| 7 | 2097152 |
| 8 | 0 |
| 9 | 5077565 |
| 10 | 73741824 |
| 11 | 15579352 |
| 12 | 352387072 |
| 13 | 769038655 |
| 14 | 195124224 |
| 15 | 1009588832 |
| 16 | 0 |
| 17 | 4384458125 |
| 18 | 2836131328 |
| 19 | 9009163584 |
| 20 | 7006846976 |
| 21 | 33653509289 |
| 22 | 41376995328 |
| 23 | 17808619293 |
| 24 | 26138902528 |
| 25 | 11605068943 |
| 26 | 200037316608 |
| 27 | 161669290688 |