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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 43 |
| 6 | 114 |
| 7 | 300 |
| 8 | 784 |
| 9 | 2037 |
| 10 | 5266 |
| 11 | 13554 |
| 12 | 34752 |
| 13 | 88799 |
| 14 | 226210 |
| 15 | 574680 |
| 16 | 1456352 |
| 17 | 3682409 |
| 18 | 9292002 |
| 19 | 23403102 |
| 20 | 58842416 |
| 21 | 147713043 |
| 22 | 370262930 |
| 23 | 926852868 |
| 24 | 2317191024 |
| 25 | 5786293597 |
| 26 | 14433117938 |
| 27 | 35964267594 |
| 28 | 89528469088 |
| 29 | 222666575815 |
| 30 | 553319176770 |