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 | 4 |
| 2 | 16 |
| 3 | 64 |
| 4 | 255 |
| 5 | 1016 |
| 6 | 4048 |
| 7 | 16128 |
| 8 | 64257 |
| 9 | 256012 |
| 10 | 1020000 |
| 11 | 4063872 |
| 12 | 16191231 |
| 13 | 64508912 |
| 14 | 257015648 |
| 15 | 1023998720 |
| 16 | 4079803649 |
| 17 | 16254705684 |
| 18 | 64761807088 |
| 19 | 258023229632 |
| 20 | 1028013114879 |
| 21 | 4095797753832 |
| 22 | 16318429208240 |
| 23 | 65015693603328 |