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 | 1 |
| 1 | 8 |
| 2 | 52 |
| 3 | 350 |
| 4 | 2416 |
| 5 | 16838 |
| 6 | 117712 |
| 7 | 823670 |
| 8 | 5765056 |
| 9 | 40354118 |
| 10 | 282476272 |
| 11 | 1977328790 |
| 12 | 13841291296 |
| 13 | 96889018598 |
| 14 | 678223089232 |
| 15 | 4747561542710 |
| 16 | 33232930635136 |
| 17 | 232630514118278 |
| 18 | 1628413598172592 |
| 19 | 11398895185897430 |
| 20 | 79792266298660576 |
| 21 | 558545864085381158 |
| 22 | 3909821048587182352 |