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 | 46 |
| 4 | 342 |
| 5 | 3108 |
| 6 | 33324 |
| 7 | 411360 |
| 8 | 5741856 |
| 9 | 89379120 |
| 10 | 1534623936 |
| 11 | 28804923024 |
| 12 | 586686138384 |
| 13 | 12885385945248 |
| 14 | 303537419684064 |
| 15 | 7633673997722496 |
| 16 | 204125888803996800 |
| 17 | 5782960189212871680 |