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 | 3 |
| 3 | 8 |
| 4 | 21 |
| 5 | 54 |
| 6 | 137 |
| 7 | 344 |
| 8 | 856 |
| 9 | 2113 |
| 10 | 5179 |
| 11 | 12614 |
| 12 | 30548 |
| 13 | 73595 |
| 14 | 176455 |
| 15 | 421215 |
| 16 | 1001388 |
| 17 | 2371678 |
| 18 | 5597245 |
| 19 | 13166069 |
| 20 | 30873728 |
| 21 | 72185937 |
| 22 | 168313391 |
| 23 | 391428622 |
| 24 | 908058205 |
| 25 | 2101629502 |
| 26 | 4853215947 |
| 27 | 11183551059 |
| 28 | 25718677187 |
| 29 | 59030344851 |
| 30 | 135237134812 |
| 31 | 309274516740 |