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 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 0 |
| 7 | 18 |
| 8 | 21 |
| 9 | 25 |
| 10 | 0 |
| 11 | 1606 |
| 12 | 1173 |
| 13 | 774 |
| 14 | 543 |
| 15 | 0 |
| 16 | 565080 |
| 17 | 271790 |
| 18 | 122595 |
| 19 | 59830 |
| 20 | 29281 |
| 21 | 0 |
| 22 | 734774776 |
| 23 | 229224750 |
| 24 | 70500705 |
| 25 | 25349355 |
| 26 | 10110735 |
| 27 | 3781503 |
| 28 | 0 |
| 29 | 3523091615568 |
| 30 | 685793359804 |
| 31 | 138122171880 |
| 32 | 35130437825 |
| 33 | 11002159455 |
| 34 | 3767987307 |
| 35 | 1138779265 |