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 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 2 |
| 7 | 11 |
| 8 | 17 |
| 9 | 55 |
| 10 | 107 |
| 11 | 317 |
| 12 | 720 |
| 13 | 1938 |
| 14 | 4803 |
| 15 | 12707 |
| 16 | 32311 |
| 17 | 85168 |
| 18 | 220879 |
| 19 | 581112 |
| 20 | 1522095 |
| 21 | 4014186 |
| 22 | 10568936 |
| 23 | 27934075 |
| 24 | 73826753 |
| 25 | 195497427 |
| 26 | 517927859 |
| 27 | 1373858931 |
| 28 | 3646158317 |
| 29 | 9684878325 |
| 30 | 25737819213 |
| 31 | 68439951884 |
| 32 | 182070121870 |
| 33 | 484583900955 |
| 34 | 1290213371950 |