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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 5 |
| 6 | 17 |
| 7 | 28 |
| 8 | 77 |
| 9 | 160 |
| 10 | 381 |
| 11 | 874 |
| 12 | 2127 |
| 13 | 5117 |
| 14 | 12339 |
| 15 | 30504 |
| 16 | 74139 |
| 17 | 182109 |
| 18 | 443685 |
| 19 | 1111475 |
| 20 | 2735692 |
| 21 | 6782748 |
| 22 | 16853486 |
| 23 | 42013901 |
| 24 | 104671293 |
| 25 | 262299143 |
| 26 | 657330956 |
| 27 | 1650934893 |
| 28 | 4150915841 |
| 29 | 10458898439 |
| 30 | 26396485368 |