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 | 64 |
| 2 | 8192 |
| 3 | 139968 |
| 4 | 1048576 |
| 5 | 5000000 |
| 6 | 17915904 |
| 7 | 52706752 |
| 8 | 134217728 |
| 9 | 306110016 |
| 10 | 640000000 |
| 11 | 1247178944 |
| 12 | 2293235712 |
| 13 | 4015905088 |
| 14 | 6746464256 |
| 15 | 10935000000 |
| 16 | 17179869184 |
| 17 | 26261675072 |
| 18 | 39182082048 |
| 19 | 57207791296 |
| 20 | 81920000000 |
| 21 | 115269666624 |
| 22 | 159638904832 |
| 23 | 217908828608 |