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 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 47 |
| 5 | 148 |
| 6 | 518 |
| 7 | 1977 |
| 8 | 8138 |
| 9 | 35879 |
| 10 | 168500 |
| 11 | 838944 |
| 12 | 4409957 |
| 13 | 24385913 |
| 14 | 141412615 |
| 15 | 857611641 |
| 16 | 5426144191 |
| 17 | 35739397738 |
| 18 | 244573978098 |
| 19 | 1735854397529 |
| 20 | 12757309001222 |
| 21 | 96941738970957 |
| 22 | 760649367654460 |
| 23 | 6155205917196408 |
| 24 | 51308394497243469 |
| 25 | 440110582561558831 |