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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 2 |
| 9 | 0 |
| 10 | 1 |
| 11 | 1 |
| 12 | 3 |
| 13 | 6 |
| 14 | 0 |
| 15 | 1 |
| 16 | 1 |
| 17 | 3 |
| 18 | 12 |
| 19 | 24 |
| 20 | 0 |
| 21 | 1 |
| 22 | 1 |
| 23 | 3 |
| 24 | 13 |
| 25 | 66 |
| 26 | 120 |
| 27 | 0 |
| 28 | 1 |
| 29 | 1 |
| 30 | 3 |
| 31 | 13 |
| 32 | 74 |
| 33 | 450 |
| 34 | 720 |
| 35 | 0 |
| 36 | 1 |
| 37 | 1 |
| 38 | 3 |
| 39 | 13 |
| 40 | 75 |
| 41 | 530 |
| 42 | 3690 |
| 43 | 5040 |
| 44 | 0 |
| 45 | 1 |
| 46 | 1 |
| 47 | 3 |
| 48 | 13 |
| 49 | 75 |
| 50 | 540 |
| 51 | 4550 |
| 52 | 35280 |
| 53 | 40320 |
| 54 | 0 |
| 55 | 1 |
| 56 | 1 |
| 57 | 3 |
| 58 | 13 |
| 59 | 75 |
| 60 | 541 |
| 61 | 4670 |
| 62 | 45570 |
| 63 | 385560 |
| 64 | 362880 |
| 65 | 0 |