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 | 1 |
| 5 | 4 |
| 6 | 12 |
| 7 | 30 |
| 8 | 70 |
| 9 | 156 |
| 10 | 339 |
| 11 | 722 |
| 12 | 1515 |
| 13 | 3140 |
| 14 | 6444 |
| 15 | 13116 |
| 16 | 26513 |
| 17 | 53280 |
| 18 | 106530 |
| 19 | 212062 |
| 20 | 420503 |
| 21 | 830964 |
| 22 | 1637055 |
| 23 | 3216240 |
| 24 | 6303099 |
| 25 | 12324816 |
| 26 | 24049953 |
| 27 | 46841550 |
| 28 | 91074760 |
| 29 | 176796340 |
| 30 | 342696000 |
| 31 | 663363750 |
| 32 | 1282457260 |
| 33 | 2476394580 |