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 | 11 |
| 3 | 13 |
| 4 | 33 |
| 5 | 58 |
| 6 | 153 |
| 7 | 336 |
| 8 | 937 |
| 9 | 2449 |
| 10 | 6560 |
| 11 | 18488 |
| 12 | 52053 |
| 13 | 147896 |
| 14 | 425764 |
| 15 | 1229112 |
| 16 | 3561761 |
| 17 | 10353391 |
| 18 | 30135225 |
| 19 | 87835075 |
| 20 | 256217794 |
| 21 | 747737289 |
| 22 | 2183170380 |
| 23 | 6375689391 |
| 24 | 18622164403 |
| 25 | 54399493814 |
| 26 | 158924553086 |
| 27 | 464309179701 |