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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 20 |
| 6 | 45 |
| 7 | 96 |
| 8 | 201 |
| 9 | 414 |
| 10 | 851 |
| 11 | 1738 |
| 12 | 3531 |
| 13 | 7163 |
| 14 | 14483 |
| 15 | 29255 |
| 16 | 58993 |
| 17 | 118820 |
| 18 | 239143 |
| 19 | 480897 |
| 20 | 966550 |
| 21 | 1941540 |
| 22 | 3898356 |
| 23 | 7824444 |
| 24 | 15699344 |
| 25 | 31490742 |
| 26 | 63151054 |
| 27 | 126614174 |
| 28 | 253804612 |
| 29 | 508678161 |
| 30 | 1019341795 |
| 31 | 2042386082 |
| 32 | 4091687074 |
| 33 | 8196318785 |
| 34 | 16416930072 |