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 | 3 |
| 3 | 12 |
| 4 | 49 |
| 5 | 217 |
| 6 | 1006 |
| 7 | 4810 |
| 8 | 23576 |
| 9 | 117812 |
| 10 | 597937 |
| 11 | 3073874 |
| 12 | 15972678 |
| 13 | 83758809 |
| 14 | 442681653 |
| 15 | 2355678968 |
| 16 | 12610759255 |
| 17 | 67868269712 |
| 18 | 366979432955 |
| 19 | 1992755590086 |
| 20 | 10862329206524 |
| 21 | 59414599714958 |
| 22 | 326009477088080 |
| 23 | 1793977307978268 |
| 24 | 9898072238695390 |
| 25 | 54744525395860053 |
| 26 | 303463833091357785 |