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 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 128 |
| 5 | 605 |
| 6 | 3072 |
| 7 | 16807 |
| 8 | 82944 |
| 9 | 412164 |
| 10 | 2035220 |
| 11 | 9864899 |
| 12 | 47579136 |
| 13 | 227902597 |
| 14 | 1084320412 |
| 15 | 5134860060 |
| 16 | 24207040512 |
| 17 | 113664879137 |
| 18 | 531895993344 |
| 19 | 2481300851179 |
| 20 | 11543181696640 |
| 21 | 53565699079956 |
| 22 | 248005494380204 |
| 23 | 1145875775104967 |
| 24 | 5284358088818688 |