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 | 100 |
| 3 | 102 |
| 4 | 498 |
| 5 | 267670 |
| 6 | 26734060 |
| 7 | 26734062 |
| 8 | 31253680 |
| 9 | 65974998 |
| 10 | 70938496 |
| 11 | 118428800 |
| 12 | 1232747200 |
| 13 | 2764919296 |
| 14 | 3149734998 |
| 15 | 3149735000 |
| 16 | 3413655896 |
| 17 | 3415058276 |
| 18 | 3755544796 |
| 19 | 4446555802 |
| 20 | 5727840798 |
| 21 | 6156991616 |
| 22 | 10080661998 |
| 23 | 10464983096 |
| 24 | 11054945296 |
| 25 | 11953158220 |