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 | 2 |
| 2 | 8 |
| 3 | 44 |
| 4 | 304 |
| 5 | 2512 |
| 6 | 24064 |
| 7 | 261536 |
| 8 | 3173888 |
| 9 | 42483968 |
| 10 | 621159424 |
| 11 | 9841950208 |
| 12 | 167879268352 |
| 13 | 3065723549696 |
| 14 | 59651093528576 |
| 15 | 1231571119812608 |
| 16 | 26883546193002496 |
| 17 | 618463501807058944 |