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 | 0 |
| 2 | 294 |
| 3 | 8232 |
| 4 | 144060 |
| 5 | 2016840 |
| 6 | 24706290 |
| 7 | 276710448 |
| 8 | 2905459704 |
| 9 | 29054597040 |
| 10 | 279650496510 |
| 11 | 2610071300760 |
| 12 | 23751648836916 |
| 13 | 211605598728888 |
| 14 | 1851548988877770 |
| 15 | 15951806673408480 |
| 16 | 135590356723972080 |
| 17 | 1138958996481365472 |
| 18 | 9467596658251350486 |
| 19 | 77968443067952298120 |