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 | 3 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 6 |
| 8 | 13 |
| 9 | 29 |
| 10 | 67 |
| 11 | 157 |
| 12 | 376 |
| 13 | 919 |
| 14 | 2287 |
| 15 | 5786 |
| 16 | 14843 |
| 17 | 38545 |
| 18 | 101191 |
| 19 | 268240 |
| 20 | 717284 |
| 21 | 1933182 |
| 22 | 5247494 |
| 23 | 14336822 |
| 24 | 39403558 |
| 25 | 108890190 |
| 26 | 302431354 |
| 27 | 843887738 |
| 28 | 2364914235 |
| 29 | 6654072084 |
| 30 | 18792428153 |
| 31 | 53259258086 |
| 32 | 151435540432 |