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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 19 |
| 6 | 42 |
| 7 | 90 |
| 8 | 198 |
| 9 | 428 |
| 10 | 936 |
| 11 | 2030 |
| 12 | 4430 |
| 13 | 9626 |
| 14 | 20978 |
| 15 | 45622 |
| 16 | 99367 |
| 17 | 216197 |
| 18 | 470736 |
| 19 | 1024420 |
| 20 | 2230183 |
| 21 | 4853881 |
| 22 | 10566170 |
| 23 | 22997974 |
| 24 | 50061240 |
| 25 | 108964596 |
| 26 | 237186018 |
| 27 | 516272178 |
| 28 | 1123772192 |
| 29 | 2446081048 |
| 30 | 5324371354 |
| 31 | 11589437278 |