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 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 33 |
| 5 | 85 |
| 6 | 218 |
| 7 | 559 |
| 8 | 1435 |
| 9 | 3682 |
| 10 | 9448 |
| 11 | 24244 |
| 12 | 62210 |
| 13 | 159633 |
| 14 | 409622 |
| 15 | 1051099 |
| 16 | 2697145 |
| 17 | 6920936 |
| 18 | 17759282 |
| 19 | 45570729 |
| 20 | 116935544 |
| 21 | 300059313 |
| 22 | 769959141 |
| 23 | 1975732973 |
| 24 | 5069776531 |
| 25 | 13009163899 |
| 26 | 33381815615 |
| 27 | 85658511370 |
| 28 | 219801722429 |
| 29 | 564016306267 |