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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 26 |
| 7 | 53 |
| 8 | 111 |
| 9 | 231 |
| 10 | 480 |
| 11 | 1000 |
| 12 | 2080 |
| 13 | 4329 |
| 14 | 9009 |
| 15 | 18747 |
| 16 | 39014 |
| 17 | 81188 |
| 18 | 168954 |
| 19 | 351597 |
| 20 | 731679 |
| 21 | 1522639 |
| 22 | 3168640 |
| 23 | 6594000 |
| 24 | 13722240 |
| 25 | 28556241 |
| 26 | 59426081 |
| 27 | 123666803 |
| 28 | 257352966 |
| 29 | 535556412 |
| 30 | 1114503066 |
| 31 | 2319302053 |