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 | 3 |
| 3 | 7 |
| 4 | 16 |
| 5 | 36 |
| 6 | 87 |
| 7 | 212 |
| 8 | 541 |
| 9 | 1403 |
| 10 | 3714 |
| 11 | 9931 |
| 12 | 26880 |
| 13 | 73230 |
| 14 | 200944 |
| 15 | 554216 |
| 16 | 1535969 |
| 17 | 4273508 |
| 18 | 11933297 |
| 19 | 33425583 |
| 20 | 93891713 |
| 21 | 264401743 |
| 22 | 746269426 |
| 23 | 2110694255 |
| 24 | 5981068081 |
| 25 | 16977958318 |
| 26 | 48271041858 |