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 | 1 |
| 2 | 4 |
| 3 | 30 |
| 4 | 344 |
| 5 | 5370 |
| 6 | 106452 |
| 7 | 2562182 |
| 8 | 72592816 |
| 9 | 2367054450 |
| 10 | 87320153900 |
| 11 | 3595646533182 |
| 12 | 163492924997448 |
| 13 | 8136172620013802 |
| 14 | 439858024910227588 |
| 15 | 25670670464821310070 |
| 16 | 1608575860476990991712 |
| 17 | 107716675117341985862370 |