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 | 3 |
| 4 | 5 |
| 5 | 16 |
| 6 | 31 |
| 7 | 102 |
| 8 | 213 |
| 9 | 712 |
| 10 | 1556 |
| 11 | 5255 |
| 12 | 11843 |
| 13 | 40288 |
| 14 | 92842 |
| 15 | 317548 |
| 16 | 744277 |
| 17 | 2556376 |
| 18 | 6072124 |
| 19 | 20926236 |
| 20 | 50244660 |
| 21 | 173634752 |
| 22 | 420634039 |
| 23 | 1456967358 |
| 24 | 3556069395 |
| 25 | 12341344216 |
| 26 | 30314970076 |
| 27 | 105384541314 |
| 28 | 260295610706 |
| 29 | 906188676224 |
| 30 | 2249045501636 |