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) |
|---|---|
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 4 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 8 |
| 15 | 0 |
| 16 | 48 |
| 17 | 0 |
| 18 | 152 |
| 19 | 0 |
| 20 | 352 |
| 21 | 0 |
| 22 | 1200 |
| 23 | 0 |
| 24 | 3752 |
| 25 | 0 |
| 26 | 12912 |
| 27 | 0 |
| 28 | 34768 |
| 29 | 0 |
| 30 | 122120 |
| 31 | 0 |
| 32 | 346128 |
| 33 | 0 |
| 34 | 1202240 |
| 35 | 0 |
| 36 | 3337424 |
| 37 | 0 |
| 38 | 11650864 |
| 39 | 0 |
| 40 | 32634960 |
| 41 | 0 |
| 42 | 113539392 |
| 43 | 0 |
| 44 | 316870592 |
| 45 | 0 |
| 46 | 1104442752 |
| 47 | 0 |
| 48 | 3086894528 |
| 49 | 0 |
| 50 | 10748713792 |
| 51 | 0 |
| 52 | 30023935744 |
| 53 | 0 |