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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 25 |
| 5 | 66 |
| 6 | 154 |
| 7 | 372 |
| 8 | 837 |
| 9 | 1930 |
| 10 | 4246 |
| 11 | 9516 |
| 12 | 20618 |
| 13 | 45332 |
| 14 | 97140 |
| 15 | 210664 |
| 16 | 447661 |
| 17 | 960858 |
| 18 | 2028478 |
| 19 | 4319100 |
| 20 | 9070110 |
| 21 | 19188796 |
| 22 | 40122028 |
| 23 | 84438360 |
| 24 | 175913250 |
| 25 | 368603716 |
| 26 | 765561564 |
| 27 | 1598231992 |
| 28 | 3310623412 |
| 29 | 6889682280 |
| 30 | 14238676712 |
| 31 | 29551095248 |