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) |
|---|---|
| 0 | 2 |
| 1 | 15 |
| 2 | 64 |
| 3 | 365 |
| 4 | 2430 |
| 5 | 16843 |
| 6 | 117692 |
| 7 | 823593 |
| 8 | 5764858 |
| 9 | 40353671 |
| 10 | 282475320 |
| 11 | 1977326821 |
| 12 | 13841287286 |
| 13 | 96889010499 |
| 14 | 678223072948 |
| 15 | 4747561510049 |
| 16 | 33232930569714 |
| 17 | 232630513987327 |
| 18 | 1628413597910576 |
| 19 | 11398895185373277 |
| 20 | 79792266297612142 |
| 21 | 558545864083284155 |
| 22 | 3909821048582988204 |