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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 2 |
| 13 | 6 |
| 14 | 11 |
| 15 | 25 |
| 16 | 49 |
| 17 | 105 |
| 18 | 211 |
| 19 | 444 |
| 20 | 903 |
| 21 | 1880 |
| 22 | 3865 |
| 23 | 8042 |
| 24 | 16658 |
| 25 | 34764 |
| 26 | 72484 |
| 27 | 151856 |
| 28 | 318418 |
| 29 | 669934 |
| 30 | 1411637 |
| 31 | 2982407 |
| 32 | 6311760 |
| 33 | 13387127 |
| 34 | 28442458 |
| 35 | 60543586 |
| 36 | 129084965 |
| 37 | 275683061 |
| 38 | 589660911 |
| 39 | 1263128375 |