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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 19 |
| 6 | 38 |
| 7 | 84 |
| 8 | 193 |
| 9 | 430 |
| 10 | 940 |
| 11 | 2074 |
| 12 | 4609 |
| 13 | 10223 |
| 14 | 22611 |
| 15 | 50022 |
| 16 | 110780 |
| 17 | 245348 |
| 18 | 543189 |
| 19 | 1202511 |
| 20 | 2662417 |
| 21 | 5894961 |
| 22 | 13051820 |
| 23 | 28897016 |
| 24 | 63979205 |
| 25 | 141653762 |
| 26 | 313629217 |
| 27 | 694390210 |
| 28 | 1537413824 |
| 29 | 3403913006 |
| 30 | 7536438344 |