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 | 3 |
| 3 | 5 |
| 4 | 8 |
| 5 | 15 |
| 6 | 29 |
| 7 | 58 |
| 8 | 122 |
| 9 | 267 |
| 10 | 607 |
| 11 | 1430 |
| 12 | 3482 |
| 13 | 8739 |
| 14 | 22555 |
| 15 | 59743 |
| 16 | 162115 |
| 17 | 449977 |
| 18 | 1275856 |
| 19 | 3690963 |
| 20 | 10882913 |
| 21 | 32674420 |
| 22 | 99806496 |
| 23 | 309930282 |
| 24 | 977731801 |
| 25 | 3131470488 |
| 26 | 10176415237 |
| 27 | 33537002728 |
| 28 | 112026106459 |