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 | -2 |
| 1 | -1 |
| 2 | 79 |
| 3 | 2399 |
| 4 | 50623 |
| 5 | 923519 |
| 6 | 15752959 |
| 7 | 260144639 |
| 8 | 4228250623 |
| 9 | 68184176639 |
| 10 | 1095222947839 |
| 11 | 17557851463679 |
| 12 | 281200199450623 |
| 13 | 4501401006735359 |
| 14 | 72040003462430719 |
| 15 | 1152780773560811519 |
| 16 | 18445618199572250623 |
| 17 | 295138898083176775679 |
| 18 | 4722294425687923097599 |