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 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 4 |
| 5 | 5 |
| 6 | 14 |
| 7 | 21 |
| 8 | 51 |
| 9 | 102 |
| 10 | 249 |
| 11 | 555 |
| 12 | 1358 |
| 13 | 3201 |
| 14 | 7890 |
| 15 | 19232 |
| 16 | 47869 |
| 17 | 118955 |
| 18 | 298875 |
| 19 | 752039 |
| 20 | 1904621 |
| 21 | 4835666 |
| 22 | 12330144 |
| 23 | 31521037 |
| 24 | 80836979 |
| 25 | 207803455 |
| 26 | 535535393 |
| 27 | 1383064966 |
| 28 | 3579351724 |
| 29 | 9280561947 |