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 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 4 |
| 8 | 14 |
| 9 | 42 |
| 10 | 114 |
| 11 | 292 |
| 12 | 714 |
| 13 | 1686 |
| 14 | 3871 |
| 15 | 8696 |
| 16 | 19178 |
| 17 | 41667 |
| 18 | 89386 |
| 19 | 189739 |
| 20 | 399144 |
| 21 | 833290 |
| 22 | 1728374 |
| 23 | 3565148 |
| 24 | 7319212 |
| 25 | 14965880 |
| 26 | 30496302 |
| 27 | 61961380 |
| 28 | 125577752 |
| 29 | 253971555 |
| 30 | 512716564 |
| 31 | 1033496947 |
| 32 | 2080572090 |
| 33 | 4183940550 |
| 34 | 8406047907 |
| 35 | 16875834728 |