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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 35 |
| 6 | 95 |
| 7 | 248 |
| 8 | 668 |
| 9 | 1781 |
| 10 | 4799 |
| 11 | 12890 |
| 12 | 34766 |
| 13 | 93647 |
| 14 | 252635 |
| 15 | 681272 |
| 16 | 1838135 |
| 17 | 4958738 |
| 18 | 13379885 |
| 19 | 36100214 |
| 20 | 97409045 |
| 21 | 262833314 |
| 22 | 709207394 |
| 23 | 1913652308 |
| 24 | 5163654671 |
| 25 | 13933178390 |
| 26 | 37596275726 |
| 27 | 101446960109 |
| 28 | 273737216768 |
| 29 | 738632652929 |
| 30 | 1993073801930 |