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 | 4 |
| 3 | 15 |
| 4 | 44 |
| 5 | 120 |
| 6 | 319 |
| 7 | 804 |
| 8 | 1960 |
| 9 | 4652 |
| 10 | 10782 |
| 11 | 24435 |
| 12 | 54329 |
| 13 | 118663 |
| 14 | 254969 |
| 15 | 539825 |
| 16 | 1127247 |
| 17 | 2323811 |
| 18 | 4733634 |
| 19 | 9535025 |
| 20 | 19005218 |
| 21 | 37507726 |
| 22 | 73333405 |
| 23 | 142112298 |
| 24 | 273092198 |
| 25 | 520612163 |
| 26 | 984943887 |
| 27 | 1849920530 |
| 28 | 3450475858 |
| 29 | 6393203485 |
| 30 | 11770416017 |
| 31 | 21538245911 |
| 32 | 39181212114 |