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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 0 |
| 19 | 0 |
| 20 | 0 |
| 21 | 11 |
| 22 | 594 |
| 23 | 10296 |
| 24 | 84084 |
| 25 | 378378 |
| 26 | 1009008 |
| 27 | 1633632 |
| 28 | 1575288 |
| 29 | 831402 |
| 30 | 184756 |
| 31 | 0 |
| 32 | 121 |
| 33 | 13794 |
| 34 | 686070 |
| 35 | 19744296 |
| 36 | 375698466 |
| 37 | 5114697588 |
| 38 | 52484019588 |
| 39 | 421146343332 |
| 40 | 2715042399498 |
| 41 | 14352204442576 |