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) |
|---|---|
| 3 | 1 |
| 4 | 12 |
| 5 | 95 |
| 6 | 639 |
| 7 | 3917 |
| 8 | 23377 |
| 9 | 132553 |
| 10 | 762434 |
| 11 | 4201955 |
| 12 | 23901906 |
| 13 | 130453555 |
| 14 | 740755012 |
| 15 | 4035754137 |
| 16 | 22952934073 |
| 17 | 125259143235 |
| 18 | 714206660342 |
| 19 | 3909459844469 |
| 20 | 22346990842402 |
| 21 | 122748276118411 |
| 22 | 703146926077588 |
| 23 | 3875572768594421 |
| 24 | 22238537172443007 |
| 25 | 122969745150601115 |