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 | 2 |
| 2 | 6 |
| 3 | 35 |
| 4 | 327 |
| 5 | 3989 |
| 6 | 59605 |
| 7 | 1052849 |
| 8 | 21460093 |
| 9 | 495764694 |
| 10 | 12800845442 |
| 11 | 365323615366 |
| 12 | 11419131242071 |
| 13 | 387977390372850 |
| 14 | 14236659589753582 |
| 15 | 561109543344974894 |
| 16 | 23640346895461300428 |
| 17 | 1060265646084471617080 |
| 18 | 50434955069054663240728 |