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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 17 |
| 7 | 44 |
| 8 | 118 |
| 9 | 338 |
| 10 | 1003 |
| 11 | 3039 |
| 12 | 9466 |
| 13 | 30009 |
| 14 | 96757 |
| 15 | 316429 |
| 16 | 1047683 |
| 17 | 3511473 |
| 18 | 11876457 |
| 19 | 40537388 |
| 20 | 139490014 |
| 21 | 483393651 |
| 22 | 1686007017 |
| 23 | 5917253784 |
| 24 | 20879801881 |
| 25 | 74038098051 |
| 26 | 263793988890 |
| 27 | 943928231920 |
| 28 | 3390975927021 |
| 29 | 12227214763162 |
| 30 | 44242758258306 |