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 | 3 |
| 2 | 19 |
| 3 | 76 |
| 4 | 283 |
| 5 | 1046 |
| 6 | 3890 |
| 7 | 14582 |
| 8 | 55051 |
| 9 | 209062 |
| 10 | 797806 |
| 11 | 3056868 |
| 12 | 11752674 |
| 13 | 45316896 |
| 14 | 175175816 |
| 15 | 678639146 |
| 16 | 2634146411 |
| 17 | 10241938406 |
| 18 | 39882831446 |
| 19 | 155519160716 |
| 20 | 607181138846 |
| 21 | 2373227900936 |
| 22 | 9285480209456 |
| 23 | 36364319046896 |