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 | 6 |
| 2 | 24 |
| 3 | 128 |
| 4 | 576 |
| 5 | 2778 |
| 6 | 12440 |
| 7 | 57992 |
| 8 | 262444 |
| 9 | 1202540 |
| 10 | 5463896 |
| 11 | 24922570 |
| 12 | 113239064 |
| 13 | 515471532 |
| 14 | 2342330752 |
| 15 | 10649798938 |