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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 37 |
| 5 | 91 |
| 6 | 234 |
| 7 | 588 |
| 8 | 1502 |
| 9 | 3808 |
| 10 | 9715 |
| 11 | 24727 |
| 12 | 63095 |
| 13 | 160899 |
| 14 | 410764 |
| 15 | 1048598 |
| 16 | 2678327 |
| 17 | 6841725 |
| 18 | 17482478 |
| 19 | 44678724 |
| 20 | 114205286 |
| 21 | 291963048 |
| 22 | 746504245 |
| 23 | 1908907425 |
| 24 | 4881860810 |
| 25 | 12486083994 |
| 26 | 31937825727 |
| 27 | 81699259367 |