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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 25 |
| 6 | 101 |
| 7 | 436 |
| 8 | 1971 |
| 9 | 9159 |
| 10 | 43262 |
| 11 | 206285 |
| 12 | 988963 |
| 13 | 4755888 |
| 14 | 22910979 |
| 15 | 110480787 |
| 16 | 533057462 |
| 17 | 2572761417 |
| 18 | 12419474751 |
| 19 | 59958562568 |
| 20 | 289483787719 |
| 21 | 1397691920591 |
| 22 | 6748491159958 |
| 23 | 32584154032229 |
| 24 | 157329000870907 |