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 | 2 |
| 5 | 6 |
| 6 | 0 |
| 7 | 6 |
| 8 | 24 |
| 9 | 60 |
| 10 | 0 |
| 11 | 24 |
| 12 | 120 |
| 13 | 360 |
| 14 | 840 |
| 15 | 0 |
| 16 | 120 |
| 17 | 720 |
| 18 | 2520 |
| 19 | 6720 |
| 20 | 15120 |
| 21 | 0 |
| 22 | 720 |
| 23 | 5040 |
| 24 | 20160 |
| 25 | 60480 |
| 26 | 151200 |
| 27 | 332640 |
| 28 | 0 |
| 29 | 5040 |
| 30 | 40320 |
| 31 | 181440 |
| 32 | 604800 |
| 33 | 1663200 |
| 34 | 3991680 |
| 35 | 8648640 |
| 36 | 0 |
| 37 | 40320 |
| 38 | 362880 |
| 39 | 1814400 |
| 40 | 6652800 |
| 41 | 19958400 |
| 42 | 51891840 |
| 43 | 121080960 |
| 44 | 259459200 |