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) |
|---|---|
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 6 |
| 12 | 21 |
| 13 | 56 |
| 14 | 126 |
| 15 | 253 |
| 16 | 468 |
| 17 | 819 |
| 18 | 1385 |
| 19 | 2317 |
| 20 | 3928 |
| 21 | 6908 |
| 22 | 12803 |
| 23 | 25079 |
| 24 | 51415 |
| 25 | 108598 |
| 26 | 232784 |
| 27 | 500780 |
| 28 | 1073700 |
| 29 | 2285703 |
| 30 | 4822956 |
| 31 | 10082161 |
| 32 | 20884730 |
| 33 | 42892750 |
| 34 | 87405633 |
| 35 | 176867184 |
| 36 | 355685658 |
| 37 | 711460052 |
| 38 | 1416584340 |
| 39 | 2809770487 |
| 40 | 5555833511 |