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 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | 1 |
| 9 | 3 |
| 10 | 2 |
| 11 | 5 |
| 12 | 5 |
| 13 | 13 |
| 14 | 13 |
| 15 | 29 |
| 16 | 32 |
| 17 | 71 |
| 18 | 81 |
| 19 | 177 |
| 20 | 209 |
| 21 | 449 |
| 22 | 538 |
| 23 | 1148 |
| 24 | 1415 |
| 25 | 3002 |
| 26 | 3736 |
| 27 | 7862 |
| 28 | 9930 |
| 29 | 20877 |
| 30 | 26648 |
| 31 | 55756 |
| 32 | 71767 |
| 33 | 149860 |
| 34 | 194507 |
| 35 | 405332 |
| 36 | 529708 |
| 37 | 1101502 |
| 38 | 1447956 |
| 39 | 3006750 |
| 40 | 3974959 |
| 41 | 8242691 |
| 42 | 10948355 |
| 43 | 22673357 |
| 44 | 30249668 |
| 45 | 62583402 |
| 46 | 83831176 |
| 47 | 173259448 |
| 48 | 232917913 |
| 49 | 480970826 |
| 50 | 648753720 |