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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 21 |
| 7 | 53 |
| 8 | 151 |
| 9 | 458 |
| 10 | 1477 |
| 11 | 4918 |
| 12 | 16956 |
| 13 | 59494 |
| 14 | 212364 |
| 15 | 766753 |
| 16 | 2796876 |
| 17 | 10284793 |
| 18 | 38096072 |
| 19 | 141998218 |
| 20 | 532301941 |
| 21 | 2005638293 |
| 22 | 7592441954 |
| 23 | 28865031086 |
| 24 | 110174528925 |
| 25 | 422064799013 |
| 26 | 1622379252093 |