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 | 5 |
| 2 | 21 |
| 3 | 78 |
| 4 | 285 |
| 5 | 1048 |
| 6 | 3892 |
| 7 | 14584 |
| 8 | 55053 |
| 9 | 209064 |
| 10 | 797808 |
| 11 | 3056870 |
| 12 | 11752676 |
| 13 | 45316898 |
| 14 | 175175818 |
| 15 | 678639148 |
| 16 | 2634146413 |
| 17 | 10241938408 |
| 18 | 39882831448 |
| 19 | 155519160718 |
| 20 | 607181138848 |
| 21 | 2373227900938 |
| 22 | 9285480209458 |
| 23 | 36364319046898 |