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) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 18 |
| 4 | 4 |
| 5 | 0 |
| 6 | 58 |
| 7 | 0 |
| 8 | 68 |
| 9 | 504 |
| 10 | 754 |
| 11 | 0 |
| 12 | 1562 |
| 13 | 0 |
| 14 | 2062 |
| 15 | 2518 |
| 16 | 580 |
| 17 | 0 |
| 18 | 922 |
| 19 | 0 |
| 20 | 818 |
| 21 | 6535 |
| 22 | 7990 |
| 23 | 0 |
| 24 | 12058 |
| 25 | 250 |
| 26 | 4398 |
| 27 | 2691 |
| 28 | 10358 |
| 29 | 0 |
| 30 | 12422 |
| 31 | 0 |
| 32 | 16964 |
| 33 | 10666 |
| 34 | 29482 |
| 35 | 3680 |
| 36 | 42818 |
| 37 | 0 |
| 38 | 41158 |
| 39 | 19791 |
| 40 | 13618 |
| 41 | 0 |
| 42 | 54430 |
| 43 | 0 |
| 44 | 71942 |
| 45 | 40993 |
| 46 | 73006 |
| 47 | 0 |
| 48 | 12058 |
| 49 | 3430 |
| 50 | 122254 |
| 51 | 98278 |
| 52 | 127494 |
| 53 | 0 |