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 | 44 |
| 2 | 1056 |
| 3 | 18304 |
| 4 | 256256 |
| 5 | 3075072 |
| 6 | 32800768 |
| 7 | 318636032 |
| 8 | 2867724288 |
| 9 | 24216338432 |
| 10 | 193730707456 |
| 11 | 1479398129664 |
| 12 | 10848919617536 |
| 13 | 76776969601024 |
| 14 | 526470648692736 |
| 15 | 3509804324618240 |
| 16 | 22813728110018560 |
| 17 | 144934272698941440 |
| 18 | 901813252348968960 |
| 19 | 5505807224867389440 |