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 | 0 |
| 1 | 3 |
| 2 | 6 |
| 3 | 13 |
| 4 | 30 |
| 5 | 70 |
| 6 | 163 |
| 7 | 379 |
| 8 | 881 |
| 9 | 2048 |
| 10 | 4761 |
| 11 | 11068 |
| 12 | 25730 |
| 13 | 59815 |
| 14 | 139053 |
| 15 | 323259 |
| 16 | 751486 |
| 17 | 1746993 |
| 18 | 4061266 |
| 19 | 9441298 |
| 20 | 21948355 |
| 21 | 51023735 |
| 22 | 118615793 |
| 23 | 275748264 |
| 24 | 641036941 |
| 25 | 1490230088 |
| 26 | 3464364646 |
| 27 | 8053670703 |
| 28 | 18722512905 |
| 29 | 43524561955 |
| 30 | 101182330758 |
| 31 | 235220381269 |