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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 231700599 |
| 6 | 1069467839 |
| 7 | 1156703470 |
| 8 | 1241186868 |
| 9 | 2533742848 |
| 10 | 2684864798 |
| 11 | 3037193808 |
| 12 | 5056780650 |
| 13 | 7073145000 |
| 14 | 7557047134 |
| 15 | 9623855878 |
| 16 | 12090760318 |
| 17 | 12120887700 |
| 18 | 13816479742 |
| 19 | 14430478270 |
| 20 | 15811947072 |
| 21 | 16864260048 |
| 22 | 20905152190 |
| 23 | 22735441078 |
| 24 | 23224253128 |
| 25 | 23269229774 |
| 26 | 23766221400 |
| 27 | 25175490262 |