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 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 0 |
| 11 | 0 |
| 12 | 1 |
| 13 | 6 |
| 14 | 18 |
| 15 | 12 |
| 16 | 36 |
| 17 | 156 |
| 18 | 295 |
| 19 | 429 |
| 20 | 755 |
| 21 | 2603 |
| 22 | 7122 |
| 23 | 19232 |
| 24 | 32818 |
| 25 | 54363 |
| 26 | 172374 |
| 27 | 384053 |
| 28 | 933748 |
| 29 | 1639656 |
| 30 | 4366714 |
| 31 | 20557751 |
| 32 | 83801506 |
| 33 | 188552665 |
| 34 | 399677820 |
| 35 | 640628927 |
| 36 | 2175071240 |
| 37 | 8876685569 |
| 38 | 32786873829 |
| 39 | 108039828494 |
| 40 | 351090349416 |