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 | 1485 |
| 2 | 7260 |
| 3 | 28920 |
| 4 | 142845 |
| 5 | 2112540 |
| 6 | 10440165 |
| 7 | 41673885 |
| 8 | 205953660 |
| 9 | 3046252485 |
| 10 | 15054681960 |
| 11 | 60093684540 |
| 12 | 296985006165 |
| 13 | 4392693942120 |
| 14 | 21708840917445 |
| 15 | 86655051404085 |
| 16 | 428252172907560 |
| 17 | 6334261618255845 |
| 18 | 31304133548245020 |
| 19 | 124956524030977320 |
| 20 | 617539336347666645 |