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) |
|---|---|
| 2 | 0 |
| 3 | 3 |
| 4 | 9 |
| 5 | 23 |
| 6 | 60 |
| 7 | 151 |
| 8 | 366 |
| 9 | 877 |
| 10 | 2088 |
| 11 | 4937 |
| 12 | 11621 |
| 13 | 27285 |
| 14 | 63944 |
| 15 | 149652 |
| 16 | 349924 |
| 17 | 817712 |
| 18 | 1910027 |
| 19 | 4460139 |
| 20 | 10412815 |
| 21 | 24306706 |
| 22 | 56733689 |
| 23 | 132411638 |
| 24 | 309022917 |
| 25 | 721175422 |
| 26 | 1682988807 |
| 27 | 3927486177 |
| 28 | 9165229371 |
| 29 | 21387927668 |
| 30 | 49910484308 |
| 31 | 116469784820 |
| 32 | 271790117108 |