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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 8 |
| 7 | 18 |
| 8 | 49 |
| 9 | 120 |
| 10 | 313 |
| 11 | 802 |
| 12 | 2120 |
| 13 | 5591 |
| 14 | 14942 |
| 15 | 40033 |
| 16 | 108108 |
| 17 | 293094 |
| 18 | 798839 |
| 19 | 2185341 |
| 20 | 6002085 |
| 21 | 16538599 |
| 22 | 45716952 |
| 23 | 126727195 |
| 24 | 352215812 |
| 25 | 981268481 |
| 26 | 2739930091 |
| 27 | 7666333161 |
| 28 | 21491833976 |
| 29 | 60358490615 |
| 30 | 169798048026 |
| 31 | 478420333601 |