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 | 4 |
| 3 | 4096 |
| 4 | 4096 |
| 5 | 4084101 |
| 6 | 4096 |
| 7 | 4782969 |
| 8 | 43046721 |
| 9 | 40353607 |
| 10 | 41426511213649 |
| 11 | 4194304 |
| 12 | 4096 |
| 13 | 4503599627370496 |
| 14 | 4782969 |
| 15 | 470184984576 |
| 16 | 43046721 |
| 17 | 456487940826035155404146917 |
| 18 | 426878854210636742656 |
| 19 | 4394336169668803158610484050361 |
| 20 | 4064231406647572522401601 |