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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 4 |
| 7 | 10 |
| 8 | 36 |
| 9 | 83 |
| 10 | 225 |
| 11 | 573 |
| 12 | 1444 |
| 13 | 3996 |
| 14 | 11840 |
| 15 | 34057 |
| 16 | 95573 |
| 17 | 267643 |
| 18 | 754744 |
| 19 | 2167250 |
| 20 | 6347944 |
| 21 | 18754719 |
| 22 | 55183269 |
| 23 | 161366349 |
| 24 | 471263668 |
| 25 | 1382569548 |
| 26 | 4085677052 |
| 27 | 12145287569 |
| 28 | 36193473369 |
| 29 | 107824201547 |
| 30 | 320874528844 |
| 31 | 954819540526 |
| 32 | 2845349212512 |