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 | 4 |
| 5 | 1 |
| 6 | 0 |
| 7 | 48 |
| 8 | 12 |
| 9 | 1 |
| 10 | 0 |
| 11 | 1088 |
| 12 | 272 |
| 13 | 24 |
| 14 | 1 |
| 15 | 0 |
| 16 | 39680 |
| 17 | 9920 |
| 18 | 880 |
| 19 | 40 |
| 20 | 1 |
| 21 | 0 |
| 22 | 2122752 |
| 23 | 530688 |
| 24 | 47104 |
| 25 | 2160 |
| 26 | 60 |
| 27 | 1 |
| 28 | 0 |
| 29 | 156577792 |
| 30 | 39144448 |
| 31 | 3474688 |
| 32 | 159488 |
| 33 | 4480 |
| 34 | 84 |
| 35 | 1 |
| 36 | 0 |
| 37 | 15230058496 |
| 38 | 3807514624 |
| 39 | 337979392 |
| 40 | 15514880 |
| 41 | 436352 |
| 42 | 8288 |
| 43 | 112 |
| 44 | 1 |