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 | 1 |
| 4 | 2 |
| 5 | 7 |
| 6 | 22 |
| 7 | 57 |
| 8 | 128 |
| 9 | 264 |
| 10 | 529 |
| 11 | 1079 |
| 12 | 2290 |
| 13 | 5022 |
| 14 | 11148 |
| 15 | 24633 |
| 16 | 53824 |
| 17 | 116472 |
| 18 | 250880 |
| 19 | 540536 |
| 20 | 1167937 |
| 21 | 2531061 |
| 22 | 5494247 |
| 23 | 11928731 |
| 24 | 25880583 |
| 25 | 56101768 |
| 26 | 121544393 |
| 27 | 263289438 |
| 28 | 570427339 |
| 29 | 1236159756 |
| 30 | 2679343966 |
| 31 | 5807782301 |